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Finding the Fourth Proportional to 145,230.57, 217,882.81 and 85,309.71

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Solution

The fourth proportional to 145,230.57, 217,882.81 and 85,309.71 is: 127,986.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,230.57 : 217,882.81 = 85,309.71 : x
  2. Step 2: Convert to fraction form
    145,230.57/217,882.81 = 85,309.71/x
  3. Step 3: Cross multiply
    145,230.57x = 217,882.81 × 85,309.71
  4. Step 4: Simplify right side
    145,230.57x = 18,587,519,938.87
  5. Step 5: Solve for x
    x = 18,587,519,938.87/145,230.57
  6. Step 6: Final answer
    x = 127,986.28

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