Finding the Fourth Proportional to 2,643.46, 3,963.71 and 887.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.46 : 3,963.71 = 887.56 : x
2. Step 2: Convert to fraction form
   2,643.46/3,963.71 = 887.56/x
3. Step 3: Cross multiply
   2,643.46x = 3,963.71 × 887.56
4. Step 4: Simplify right side
   2,643.46x = 3,518,020.26
5. Step 5: Solve for x
   x = 3,518,020.26/2,643.46
6. Step 6: Final answer
   x = 1,330.84