Finding the Fourth Proportional to 2,643.64, 3,962.71 and 887.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.64 : 3,962.71 = 887.34 : x
2. Step 2: Convert to fraction form
   2,643.64/3,962.71 = 887.34/x
3. Step 3: Cross multiply
   2,643.64x = 3,962.71 × 887.34
4. Step 4: Simplify right side
   2,643.64x = 3,516,271.09
5. Step 5: Solve for x
   x = 3,516,271.09/2,643.64
6. Step 6: Final answer
   x = 1,330.09