Finding the Fourth Proportional to 9,255.57, 12,687.02 and 9,130.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,255.57 : 12,687.02 = 9,130.98 : x
2. Step 2: Convert to fraction form
   9,255.57/12,687.02 = 9,130.98/x
3. Step 3: Cross multiply
   9,255.57x = 12,687.02 × 9,130.98
4. Step 4: Simplify right side
   9,255.57x = 115,844,880.22
5. Step 5: Solve for x
   x = 115,844,880.22/9,255.57
6. Step 6: Final answer
   x = 12,516.23