Finding the Fourth Proportional to 3,123.31, 4,683.83 and 931.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,123.31 : 4,683.83 = 931.30 : x
2. Step 2: Convert to fraction form
   3,123.31/4,683.83 = 931.30/x
3. Step 3: Cross multiply
   3,123.31x = 4,683.83 × 931.30
4. Step 4: Simplify right side
   3,123.31x = 4,362,034.51
5. Step 5: Solve for x
   x = 4,362,034.51/3,123.31
6. Step 6: Final answer
   x = 1,396.61