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Finding the Fourth Proportional to 1,786.72, 2,684.40 and 1,138.72

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Solution

The fourth proportional to 1,786.72, 2,684.40 and 1,138.72 is: 1,710.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.72 : 2,684.40 = 1,138.72 : x
  2. Step 2: Convert to fraction form
    1,786.72/2,684.40 = 1,138.72/x
  3. Step 3: Cross multiply
    1,786.72x = 2,684.40 × 1,138.72
  4. Step 4: Simplify right side
    1,786.72x = 3,056,779.97
  5. Step 5: Solve for x
    x = 3,056,779.97/1,786.72
  6. Step 6: Final answer
    x = 1,710.83

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