Finding the Fourth Proportional to 2,618.50, 3,928.76 and 887.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.50 : 3,928.76 = 887.12 : x
2. Step 2: Convert to fraction form
   2,618.50/3,928.76 = 887.12/x
3. Step 3: Cross multiply
   2,618.50x = 3,928.76 × 887.12
4. Step 4: Simplify right side
   2,618.50x = 3,485,281.57
5. Step 5: Solve for x
   x = 3,485,281.57/2,618.50
6. Step 6: Final answer
   x = 1,331.02