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Finding the Fourth Proportional to 79,978.65, 119,970 and 20,817.06

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Solution

The fourth proportional to 79,978.65, 119,970 and 20,817.06 is: 31,226.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,978.65 : 119,970 = 20,817.06 : x
  2. Step 2: Convert to fraction form
    79,978.65/119,970 = 20,817.06/x
  3. Step 3: Cross multiply
    79,978.65x = 119,970 × 20,817.06
  4. Step 4: Simplify right side
    79,978.65x = 2,497,422,688.20
  5. Step 5: Solve for x
    x = 2,497,422,688.20/79,978.65
  6. Step 6: Final answer
    x = 31,226.12

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