Finding the Fourth Proportional to 8,167.92, 12,308.64 and 7,388.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,167.92 : 12,308.64 = 7,388.40 : x
2. Step 2: Convert to fraction form
   8,167.92/12,308.64 = 7,388.40/x
3. Step 3: Cross multiply
   8,167.92x = 12,308.64 × 7,388.40
4. Step 4: Simplify right side
   8,167.92x = 90,941,155.78
5. Step 5: Solve for x
   x = 90,941,155.78/8,167.92
6. Step 6: Final answer
   x = 11,133.94