Finding the Fourth Proportional to 2,426.50, 3,639.78 and 887.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,426.50 : 3,639.78 = 887.50 : x
2. Step 2: Convert to fraction form
   2,426.50/3,639.78 = 887.50/x
3. Step 3: Cross multiply
   2,426.50x = 3,639.78 × 887.50
4. Step 4: Simplify right side
   2,426.50x = 3,230,304.75
5. Step 5: Solve for x
   x = 3,230,304.75/2,426.50
6. Step 6: Final answer
   x = 1,331.26