Finding the Fourth Proportional to 9,148.52, 13,689.96 and 7,920.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,148.52 : 13,689.96 = 7,920.16 : x
2. Step 2: Convert to fraction form
   9,148.52/13,689.96 = 7,920.16/x
3. Step 3: Cross multiply
   9,148.52x = 13,689.96 × 7,920.16
4. Step 4: Simplify right side
   9,148.52x = 108,426,673.59
5. Step 5: Solve for x
   x = 108,426,673.59/9,148.52
6. Step 6: Final answer
   x = 11,851.83