Finding the Fourth Proportional to 7,158.12, 9,881.92 and 5,561.20

Step by Step Solution

1. Step 1: Write the proportion equation
   7,158.12 : 9,881.92 = 5,561.20 : x
2. Step 2: Convert to fraction form
   7,158.12/9,881.92 = 5,561.20/x
3. Step 3: Cross multiply
   7,158.12x = 9,881.92 × 5,561.20
4. Step 4: Simplify right side
   7,158.12x = 54,955,333.50
5. Step 5: Solve for x
   x = 54,955,333.50/7,158.12
6. Step 6: Final answer
   x = 7,677.34