Finding the Fourth Proportional to 2,626.41, 3,938.58 and 870.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.41 : 3,938.58 = 870.87 : x
2. Step 2: Convert to fraction form
   2,626.41/3,938.58 = 870.87/x
3. Step 3: Cross multiply
   2,626.41x = 3,938.58 × 870.87
4. Step 4: Simplify right side
   2,626.41x = 3,429,991.16
5. Step 5: Solve for x
   x = 3,429,991.16/2,626.41
6. Step 6: Final answer
   x = 1,305.96