Finding the Fourth Proportional to 8,691.15, 13,026.63 and 4,001.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,691.15 : 13,026.63 = 4,001.31 : x
2. Step 2: Convert to fraction form
   8,691.15/13,026.63 = 4,001.31/x
3. Step 3: Cross multiply
   8,691.15x = 13,026.63 × 4,001.31
4. Step 4: Simplify right side
   8,691.15x = 52,123,584.89
5. Step 5: Solve for x
   x = 52,123,584.89/8,691.15
6. Step 6: Final answer
   x = 5,997.32