Finding the Fourth Proportional to 2,642.64, 3,961.22 and 886.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.64 : 3,961.22 = 886.34 : x
2. Step 2: Convert to fraction form
   2,642.64/3,961.22 = 886.34/x
3. Step 3: Cross multiply
   2,642.64x = 3,961.22 × 886.34
4. Step 4: Simplify right side
   2,642.64x = 3,510,963.50
5. Step 5: Solve for x
   x = 3,510,963.50/2,642.64
6. Step 6: Final answer
   x = 1,328.58