Finding the Fourth Proportional to 9,105.12, 12,560.04 and 5,517.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,105.12 : 12,560.04 = 5,517.72 : x
2. Step 2: Convert to fraction form
   9,105.12/12,560.04 = 5,517.72/x
3. Step 3: Cross multiply
   9,105.12x = 12,560.04 × 5,517.72
4. Step 4: Simplify right side
   9,105.12x = 69,302,783.91
5. Step 5: Solve for x
   x = 69,302,783.91/9,105.12
6. Step 6: Final answer
   x = 7,611.41