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Finding the Fourth Proportional to 210,080.72, 289,859.64 and 128,388.08

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Solution

The fourth proportional to 210,080.72, 289,859.64 and 128,388.08 is: 177,143.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,080.72 : 289,859.64 = 128,388.08 : x
  2. Step 2: Convert to fraction form
    210,080.72/289,859.64 = 128,388.08/x
  3. Step 3: Cross multiply
    210,080.72x = 289,859.64 × 128,388.08
  4. Step 4: Simplify right side
    210,080.72x = 37,214,522,649.09
  5. Step 5: Solve for x
    x = 37,214,522,649.09/210,080.72
  6. Step 6: Final answer
    x = 177,143.92

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