Finding the Fourth Proportional to 1,123.11, 1,549.92 and 680.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.11 : 1,549.92 = 680.93 : x
2. Step 2: Convert to fraction form
   1,123.11/1,549.92 = 680.93/x
3. Step 3: Cross multiply
   1,123.11x = 1,549.92 × 680.93
4. Step 4: Simplify right side
   1,123.11x = 1,055,379.28
5. Step 5: Solve for x
   x = 1,055,379.28/1,123.11
6. Step 6: Final answer
   x = 939.69