Finding the Fourth Proportional to 2,574.50, 3,861.77 and 931.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,574.50 : 3,861.77 = 931.55 : x
2. Step 2: Convert to fraction form
   2,574.50/3,861.77 = 931.55/x
3. Step 3: Cross multiply
   2,574.50x = 3,861.77 × 931.55
4. Step 4: Simplify right side
   2,574.50x = 3,597,407.88
5. Step 5: Solve for x
   x = 3,597,407.88/2,574.50
6. Step 6: Final answer
   x = 1,397.33