Finding the Fourth Proportional to 12,785.04, 17,647.92 and 7,747.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,785.04 : 17,647.92 = 7,747.20 : x
2. Step 2: Convert to fraction form
   12,785.04/17,647.92 = 7,747.20/x
3. Step 3: Cross multiply
   12,785.04x = 17,647.92 × 7,747.20
4. Step 4: Simplify right side
   12,785.04x = 136,721,965.82
5. Step 5: Solve for x
   x = 136,721,965.82/12,785.04
6. Step 6: Final answer
   x = 10,693.90