Finding the Fourth Proportional to 21,158.15, 31,726.89 and 8,675.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,158.15 : 31,726.89 = 8,675.91 : x
2. Step 2: Convert to fraction form
   21,158.15/31,726.89 = 8,675.91/x
3. Step 3: Cross multiply
   21,158.15x = 31,726.89 × 8,675.91
4. Step 4: Simplify right side
   21,158.15x = 275,259,642.22
5. Step 5: Solve for x
   x = 275,259,642.22/21,158.15
6. Step 6: Final answer
   x = 13,009.63