Finding the Fourth Proportional to 8,665.32, 12,978.54 and 8,373.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,665.32 : 12,978.54 = 8,373.72 : x
2. Step 2: Convert to fraction form
   8,665.32/12,978.54 = 8,373.72/x
3. Step 3: Cross multiply
   8,665.32x = 12,978.54 × 8,373.72
4. Step 4: Simplify right side
   8,665.32x = 108,678,659.97
5. Step 5: Solve for x
   x = 108,678,659.97/8,665.32
6. Step 6: Final answer
   x = 12,541.79