Finding the Fourth Proportional to 12,796.59, 17,648.49 and 8,316.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,796.59 : 17,648.49 = 8,316.90 : x
2. Step 2: Convert to fraction form
   12,796.59/17,648.49 = 8,316.90/x
3. Step 3: Cross multiply
   12,796.59x = 17,648.49 × 8,316.90
4. Step 4: Simplify right side
   12,796.59x = 146,780,726.48
5. Step 5: Solve for x
   x = 146,780,726.48/12,796.59
6. Step 6: Final answer
   x = 11,470.30