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Finding the Fourth Proportional to 7,999.67, 11,999.78 and 2,156.42

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Solution

The fourth proportional to 7,999.67, 11,999.78 and 2,156.42 is: 3,234.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,999.67 : 11,999.78 = 2,156.42 : x
  2. Step 2: Convert to fraction form
    7,999.67/11,999.78 = 2,156.42/x
  3. Step 3: Cross multiply
    7,999.67x = 11,999.78 × 2,156.42
  4. Step 4: Simplify right side
    7,999.67x = 25,876,494.81
  5. Step 5: Solve for x
    x = 25,876,494.81/7,999.67
  6. Step 6: Final answer
    x = 3,234.70

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