Finding the Fourth Proportional to 9,240.78, 12,749.04 and 7,116.96

Step by Step Solution

1. Step 1: Write the proportion equation
   9,240.78 : 12,749.04 = 7,116.96 : x
2. Step 2: Convert to fraction form
   9,240.78/12,749.04 = 7,116.96/x
3. Step 3: Cross multiply
   9,240.78x = 12,749.04 × 7,116.96
4. Step 4: Simplify right side
   9,240.78x = 90,734,407.72
5. Step 5: Solve for x
   x = 90,734,407.72/9,240.78
6. Step 6: Final answer
   x = 9,818.91