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Finding the Fourth Proportional to 12,215.70, 18,299.97 and 7,289.28

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Solution

The fourth proportional to 12,215.70, 18,299.97 and 7,289.28 is: 10,919.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,215.70 : 18,299.97 = 7,289.28 : x
  2. Step 2: Convert to fraction form
    12,215.70/18,299.97 = 7,289.28/x
  3. Step 3: Cross multiply
    12,215.70x = 18,299.97 × 7,289.28
  4. Step 4: Simplify right side
    12,215.70x = 133,393,605.32
  5. Step 5: Solve for x
    x = 133,393,605.32/12,215.70
  6. Step 6: Final answer
    x = 10,919.85

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