Finding the Fourth Proportional to 8,957.31, 12,357.74 and 5,552.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,957.31 : 12,357.74 = 5,552.78 : x
2. Step 2: Convert to fraction form
   8,957.31/12,357.74 = 5,552.78/x
3. Step 3: Cross multiply
   8,957.31x = 12,357.74 × 5,552.78
4. Step 4: Simplify right side
   8,957.31x = 68,619,721.96
5. Step 5: Solve for x
   x = 68,619,721.96/8,957.31
6. Step 6: Final answer
   x = 7,660.75