Finding the Fourth Proportional to 16,707.20, 25,026.72 and 7,915.40

Step by Step Solution

1. Step 1: Write the proportion equation
   16,707.20 : 25,026.72 = 7,915.40 : x
2. Step 2: Convert to fraction form
   16,707.20/25,026.72 = 7,915.40/x
3. Step 3: Cross multiply
   16,707.20x = 25,026.72 × 7,915.40
4. Step 4: Simplify right side
   16,707.20x = 198,096,499.49
5. Step 5: Solve for x
   x = 198,096,499.49/16,707.20
6. Step 6: Final answer
   x = 11,856.95