Finding the Fourth Proportional to 3,123.18, 4,685.04 and 931.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,123.18 : 4,685.04 = 931.86 : x
2. Step 2: Convert to fraction form
   3,123.18/4,685.04 = 931.86/x
3. Step 3: Cross multiply
   3,123.18x = 4,685.04 × 931.86
4. Step 4: Simplify right side
   3,123.18x = 4,365,801.37
5. Step 5: Solve for x
   x = 4,365,801.37/3,123.18
6. Step 6: Final answer
   x = 1,397.87