Finding the Fourth Proportional to 2,641.88, 3,961.91 and 886.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.88 : 3,961.91 = 886.61 : x
2. Step 2: Convert to fraction form
   2,641.88/3,961.91 = 886.61/x
3. Step 3: Cross multiply
   2,641.88x = 3,961.91 × 886.61
4. Step 4: Simplify right side
   2,641.88x = 3,512,681.15
5. Step 5: Solve for x
   x = 3,512,681.15/2,641.88
6. Step 6: Final answer
   x = 1,329.61