Finding the Fourth Proportional to 3,123, 4,685.27 and 931.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,123 : 4,685.27 = 931.72 : x
2. Step 2: Convert to fraction form
   3,123/4,685.27 = 931.72/x
3. Step 3: Cross multiply
   3,123x = 4,685.27 × 931.72
4. Step 4: Simplify right side
   3,123x = 4,365,359.76
5. Step 5: Solve for x
   x = 4,365,359.76/3,123
6. Step 6: Final answer
   x = 1,397.81