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Finding the Fourth Proportional to 109,382.80, 164,074.20 and 90,720.40

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Solution

The fourth proportional to 109,382.80, 164,074.20 and 90,720.40 is: 136,080.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,382.80 : 164,074.20 = 90,720.40 : x
  2. Step 2: Convert to fraction form
    109,382.80/164,074.20 = 90,720.40/x
  3. Step 3: Cross multiply
    109,382.80x = 164,074.20 × 90,720.40
  4. Step 4: Simplify right side
    109,382.80x = 14,884,877,053.68
  5. Step 5: Solve for x
    x = 14,884,877,053.68/109,382.80
  6. Step 6: Final answer
    x = 136,080.60

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