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Finding the Fourth Proportional to 76,679.46, 105,816.78 and 42,687

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Solution

The fourth proportional to 76,679.46, 105,816.78 and 42,687 is: 58,907.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,679.46 : 105,816.78 = 42,687 : x
  2. Step 2: Convert to fraction form
    76,679.46/105,816.78 = 42,687/x
  3. Step 3: Cross multiply
    76,679.46x = 105,816.78 × 42,687
  4. Step 4: Simplify right side
    76,679.46x = 4,517,000,887.86
  5. Step 5: Solve for x
    x = 4,517,000,887.86/76,679.46
  6. Step 6: Final answer
    x = 58,907.57

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