Finding the Fourth Proportional to 9,139.55, 12,612.80 and 5,604.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.55 : 12,612.80 = 5,604.71 : x
2. Step 2: Convert to fraction form
   9,139.55/12,612.80 = 5,604.71/x
3. Step 3: Cross multiply
   9,139.55x = 12,612.80 × 5,604.71
4. Step 4: Simplify right side
   9,139.55x = 70,691,037.24
5. Step 5: Solve for x
   x = 70,691,037.24/9,139.55
6. Step 6: Final answer
   x = 7,734.63