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Finding the Fourth Proportional to 128,438.80, 192,658.20 and 66,230.80

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Solution

The fourth proportional to 128,438.80, 192,658.20 and 66,230.80 is: 99,346.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,438.80 : 192,658.20 = 66,230.80 : x
  2. Step 2: Convert to fraction form
    128,438.80/192,658.20 = 66,230.80/x
  3. Step 3: Cross multiply
    128,438.80x = 192,658.20 × 66,230.80
  4. Step 4: Simplify right side
    128,438.80x = 12,759,906,712.56
  5. Step 5: Solve for x
    x = 12,759,906,712.56/128,438.80
  6. Step 6: Final answer
    x = 99,346.20

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