Finding the Fourth Proportional to 5,561.20, 8,299.50 and 5,113.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,561.20 : 8,299.50 = 5,113.20 : x
2. Step 2: Convert to fraction form
   5,561.20/8,299.50 = 5,113.20/x
3. Step 3: Cross multiply
   5,561.20x = 8,299.50 × 5,113.20
4. Step 4: Simplify right side
   5,561.20x = 42,437,003.40
5. Step 5: Solve for x
   x = 42,437,003.40/5,561.20
6. Step 6: Final answer
   x = 7,630.91