Finding the Fourth Proportional to 9,312.94, 12,851.86 and 5,121.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,312.94 : 12,851.86 = 5,121.18 : x
2. Step 2: Convert to fraction form
   9,312.94/12,851.86 = 5,121.18/x
3. Step 3: Cross multiply
   9,312.94x = 12,851.86 × 5,121.18
4. Step 4: Simplify right side
   9,312.94x = 65,816,688.39
5. Step 5: Solve for x
   x = 65,816,688.39/9,312.94
6. Step 6: Final answer
   x = 7,067.23