Finding the Fourth Proportional to 9,572.55, 13,216.56 and 8,561.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,572.55 : 13,216.56 = 8,561.12 : x
2. Step 2: Convert to fraction form
   9,572.55/13,216.56 = 8,561.12/x
3. Step 3: Cross multiply
   9,572.55x = 13,216.56 × 8,561.12
4. Step 4: Simplify right side
   9,572.55x = 113,148,490.06
5. Step 5: Solve for x
   x = 113,148,490.06/9,572.55
6. Step 6: Final answer
   x = 11,820.10