Finding the Fourth Proportional to 2,626.87, 3,940.53 and 871.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.87 : 3,940.53 = 871.50 : x
2. Step 2: Convert to fraction form
   2,626.87/3,940.53 = 871.50/x
3. Step 3: Cross multiply
   2,626.87x = 3,940.53 × 871.50
4. Step 4: Simplify right side
   2,626.87x = 3,434,150.01
5. Step 5: Solve for x
   x = 3,434,150.01/2,626.87
6. Step 6: Final answer
   x = 1,307.32