Finding the Fourth Proportional to 6,654.57, 9,967.54 and 3,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   6,654.57 : 9,967.54 = 3,139.30 : x
2. Step 2: Convert to fraction form
   6,654.57/9,967.54 = 3,139.30/x
3. Step 3: Cross multiply
   6,654.57x = 9,967.54 × 3,139.30
4. Step 4: Simplify right side
   6,654.57x = 31,291,098.32
5. Step 5: Solve for x
   x = 31,291,098.32/6,654.57
6. Step 6: Final answer
   x = 4,702.20