Finding the Fourth Proportional to 8,757.80, 12,085.76 and 5,613.99

Step by Step Solution

1. Step 1: Write the proportion equation
   8,757.80 : 12,085.76 = 5,613.99 : x
2. Step 2: Convert to fraction form
   8,757.80/12,085.76 = 5,613.99/x
3. Step 3: Cross multiply
   8,757.80x = 12,085.76 × 5,613.99
4. Step 4: Simplify right side
   8,757.80x = 67,849,304.50
5. Step 5: Solve for x
   x = 67,849,304.50/8,757.80
6. Step 6: Final answer
   x = 7,747.30