Finding the Fourth Proportional to 3,870.98, 5,806.42 and 949.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.98 : 5,806.42 = 949.31 : x
2. Step 2: Convert to fraction form
   3,870.98/5,806.42 = 949.31/x
3. Step 3: Cross multiply
   3,870.98x = 5,806.42 × 949.31
4. Step 4: Simplify right side
   3,870.98x = 5,512,092.57
5. Step 5: Solve for x
   x = 5,512,092.57/3,870.98
6. Step 6: Final answer
   x = 1,423.95