Finding the Fourth Proportional to 9,312.89, 12,851.53 and 5,121.14

Step by Step Solution

1. Step 1: Write the proportion equation
   9,312.89 : 12,851.53 = 5,121.14 : x
2. Step 2: Convert to fraction form
   9,312.89/12,851.53 = 5,121.14/x
3. Step 3: Cross multiply
   9,312.89x = 12,851.53 × 5,121.14
4. Step 4: Simplify right side
   9,312.89x = 65,814,407.28
5. Step 5: Solve for x
   x = 65,814,407.28/9,312.89
6. Step 6: Final answer
   x = 7,067.03