Finding the Fourth Proportional to 2,478.60, 3,717.70 and 834.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.60 : 3,717.70 = 834.71 : x
2. Step 2: Convert to fraction form
   2,478.60/3,717.70 = 834.71/x
3. Step 3: Cross multiply
   2,478.60x = 3,717.70 × 834.71
4. Step 4: Simplify right side
   2,478.60x = 3,103,180.69
5. Step 5: Solve for x
   x = 3,103,180.69/2,478.60
6. Step 6: Final answer
   x = 1,251.99