Finding the Fourth Proportional to 8,561.12, 12,861.04 and 5,100.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,561.12 : 12,861.04 = 5,100.64 : x
2. Step 2: Convert to fraction form
   8,561.12/12,861.04 = 5,100.64/x
3. Step 3: Cross multiply
   8,561.12x = 12,861.04 × 5,100.64
4. Step 4: Simplify right side
   8,561.12x = 65,599,535.07
5. Step 5: Solve for x
   x = 65,599,535.07/8,561.12
6. Step 6: Final answer
   x = 7,662.49