Finding the Fourth Proportional to 1,123.29, 1,687.10 and 930.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.29 : 1,687.10 = 930.96 : x
2. Step 2: Convert to fraction form
   1,123.29/1,687.10 = 930.96/x
3. Step 3: Cross multiply
   1,123.29x = 1,687.10 × 930.96
4. Step 4: Simplify right side
   1,123.29x = 1,570,617.96
5. Step 5: Solve for x
   x = 1,570,617.96/1,123.29
6. Step 6: Final answer
   x = 1,398.23