Finding the Fourth Proportional to 1,123.96, 1,683.31 and 1,085.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.96 : 1,683.31 = 1,085.03 : x
2. Step 2: Convert to fraction form
   1,123.96/1,683.31 = 1,085.03/x
3. Step 3: Cross multiply
   1,123.96x = 1,683.31 × 1,085.03
4. Step 4: Simplify right side
   1,123.96x = 1,826,433.43
5. Step 5: Solve for x
   x = 1,826,433.43/1,123.96
6. Step 6: Final answer
   x = 1,625.00