Finding the Fourth Proportional to 8,513.28, 12,754.56 and 7,125.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,513.28 : 12,754.56 = 7,125.12 : x
2. Step 2: Convert to fraction form
   8,513.28/12,754.56 = 7,125.12/x
3. Step 3: Cross multiply
   8,513.28x = 12,754.56 × 7,125.12
4. Step 4: Simplify right side
   8,513.28x = 90,877,770.55
5. Step 5: Solve for x
   x = 90,877,770.55/8,513.28
6. Step 6: Final answer
   x = 10,674.82