Finding the Fourth Proportional to 17,387.30, 26,079.86 and 5,540.78

Step by Step Solution

1. Step 1: Write the proportion equation
   17,387.30 : 26,079.86 = 5,540.78 : x
2. Step 2: Convert to fraction form
   17,387.30/26,079.86 = 5,540.78/x
3. Step 3: Cross multiply
   17,387.30x = 26,079.86 × 5,540.78
4. Step 4: Simplify right side
   17,387.30x = 144,502,766.69
5. Step 5: Solve for x
   x = 144,502,766.69/17,387.30
6. Step 6: Final answer
   x = 8,310.82