Finding the Fourth Proportional to 8,763.06, 12,087.72 and 5,613.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,763.06 : 12,087.72 = 5,613.78 : x
2. Step 2: Convert to fraction form
   8,763.06/12,087.72 = 5,613.78/x
3. Step 3: Cross multiply
   8,763.06x = 12,087.72 × 5,613.78
4. Step 4: Simplify right side
   8,763.06x = 67,857,800.78
5. Step 5: Solve for x
   x = 67,857,800.78/8,763.06
6. Step 6: Final answer
   x = 7,743.62