Finding the Fourth Proportional to 8,642.72, 12,966.15 and 2,799.34

Step by Step Solution

1. Step 1: Write the proportion equation
   8,642.72 : 12,966.15 = 2,799.34 : x
2. Step 2: Convert to fraction form
   8,642.72/12,966.15 = 2,799.34/x
3. Step 3: Cross multiply
   8,642.72x = 12,966.15 × 2,799.34
4. Step 4: Simplify right side
   8,642.72x = 36,296,662.34
5. Step 5: Solve for x
   x = 36,296,662.34/8,642.72
6. Step 6: Final answer
   x = 4,199.68