Finding the Fourth Proportional to 20,672.34, 31,003.38 and 8,188.08

Step by Step Solution

1. Step 1: Write the proportion equation
   20,672.34 : 31,003.38 = 8,188.08 : x
2. Step 2: Convert to fraction form
   20,672.34/31,003.38 = 8,188.08/x
3. Step 3: Cross multiply
   20,672.34x = 31,003.38 × 8,188.08
4. Step 4: Simplify right side
   20,672.34x = 253,858,155.71
5. Step 5: Solve for x
   x = 253,858,155.71/20,672.34
6. Step 6: Final answer
   x = 12,280.09