Finding the Fourth Proportional to 9,312.72, 12,851.64 and 5,121.24

Step by Step Solution

1. Step 1: Write the proportion equation
   9,312.72 : 12,851.64 = 5,121.24 : x
2. Step 2: Convert to fraction form
   9,312.72/12,851.64 = 5,121.24/x
3. Step 3: Cross multiply
   9,312.72x = 12,851.64 × 5,121.24
4. Step 4: Simplify right side
   9,312.72x = 65,816,332.83
5. Step 5: Solve for x
   x = 65,816,332.83/9,312.72
6. Step 6: Final answer
   x = 7,067.36