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Finding the Fourth Proportional to 408,695.88, 613,043.10 and 128,212.68

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Solution

The fourth proportional to 408,695.88, 613,043.10 and 128,212.68 is: 192,318.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,695.88 : 613,043.10 = 128,212.68 : x
  2. Step 2: Convert to fraction form
    408,695.88/613,043.10 = 128,212.68/x
  3. Step 3: Cross multiply
    408,695.88x = 613,043.10 × 128,212.68
  4. Step 4: Simplify right side
    408,695.88x = 78,599,898,806.51
  5. Step 5: Solve for x
    x = 78,599,898,806.51/408,695.88
  6. Step 6: Final answer
    x = 192,318.79

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