Finding the Fourth Proportional to 12,872.62, 17,766.12 and 8,157.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,872.62 : 17,766.12 = 8,157.34 : x
2. Step 2: Convert to fraction form
   12,872.62/17,766.12 = 8,157.34/x
3. Step 3: Cross multiply
   12,872.62x = 17,766.12 × 8,157.34
4. Step 4: Simplify right side
   12,872.62x = 144,924,281.32
5. Step 5: Solve for x
   x = 144,924,281.32/12,872.62
6. Step 6: Final answer
   x = 11,258.34