Finding the Fourth Proportional to 16,700.89, 25,017.31 and 7,909.15

Step by Step Solution

1. Step 1: Write the proportion equation
   16,700.89 : 25,017.31 = 7,909.15 : x
2. Step 2: Convert to fraction form
   16,700.89/25,017.31 = 7,909.15/x
3. Step 3: Cross multiply
   16,700.89x = 25,017.31 × 7,909.15
4. Step 4: Simplify right side
   16,700.89x = 197,865,657.39
5. Step 5: Solve for x
   x = 197,865,657.39/16,700.89
6. Step 6: Final answer
   x = 11,847.61