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Finding the Fourth Proportional to 91,457.65, 137,871.96 and 85,361.39

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Solution

The fourth proportional to 91,457.65, 137,871.96 and 85,361.39 is: 128,681.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,457.65 : 137,871.96 = 85,361.39 : x
  2. Step 2: Convert to fraction form
    91,457.65/137,871.96 = 85,361.39/x
  3. Step 3: Cross multiply
    91,457.65x = 137,871.96 × 85,361.39
  4. Step 4: Simplify right side
    91,457.65x = 11,768,941,458.26
  5. Step 5: Solve for x
    x = 11,768,941,458.26/91,457.65
  6. Step 6: Final answer
    x = 128,681.87

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