Finding the Fourth Proportional to 9,148.16, 13,700.37 and 8,688.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,148.16 : 13,700.37 = 8,688.89 : x
2. Step 2: Convert to fraction form
   9,148.16/13,700.37 = 8,688.89/x
3. Step 3: Cross multiply
   9,148.16x = 13,700.37 × 8,688.89
4. Step 4: Simplify right side
   9,148.16x = 119,041,007.89
5. Step 5: Solve for x
   x = 119,041,007.89/9,148.16
6. Step 6: Final answer
   x = 13,012.56