Finding the Fourth Proportional to 12,712.39, 17,542.78 and 7,047.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,712.39 : 17,542.78 = 7,047.15 : x
2. Step 2: Convert to fraction form
   12,712.39/17,542.78 = 7,047.15/x
3. Step 3: Cross multiply
   12,712.39x = 17,542.78 × 7,047.15
4. Step 4: Simplify right side
   12,712.39x = 123,626,617.35
5. Step 5: Solve for x
   x = 123,626,617.35/12,712.39
6. Step 6: Final answer
   x = 9,724.89