Finding the Fourth Proportional to 9,351.54, 12,906.72 and 8,931.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,351.54 : 12,906.72 = 8,931.15 : x
2. Step 2: Convert to fraction form
   9,351.54/12,906.72 = 8,931.15/x
3. Step 3: Cross multiply
   9,351.54x = 12,906.72 × 8,931.15
4. Step 4: Simplify right side
   9,351.54x = 115,271,852.33
5. Step 5: Solve for x
   x = 115,271,852.33/9,351.54
6. Step 6: Final answer
   x = 12,326.51