Finding the Fourth Proportional to 9,312.72, 12,851.55 and 5,120.97

Step by Step Solution

1. Step 1: Write the proportion equation
   9,312.72 : 12,851.55 = 5,120.97 : x
2. Step 2: Convert to fraction form
   9,312.72/12,851.55 = 5,120.97/x
3. Step 3: Cross multiply
   9,312.72x = 12,851.55 × 5,120.97
4. Step 4: Simplify right side
   9,312.72x = 65,812,402.00
5. Step 5: Solve for x
   x = 65,812,402.00/9,312.72
6. Step 6: Final answer
   x = 7,066.94