Finding the Fourth Proportional to 2,642.82, 3,963.78 and 887.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.82 : 3,963.78 = 887.58 : x
2. Step 2: Convert to fraction form
   2,642.82/3,963.78 = 887.58/x
3. Step 3: Cross multiply
   2,642.82x = 3,963.78 × 887.58
4. Step 4: Simplify right side
   2,642.82x = 3,518,171.85
5. Step 5: Solve for x
   x = 3,518,171.85/2,642.82
6. Step 6: Final answer
   x = 1,331.22