Finding the Fourth Proportional to 1,123.07, 1,549.76 and 680.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.07 : 1,549.76 = 680.85 : x
2. Step 2: Convert to fraction form
   1,123.07/1,549.76 = 680.85/x
3. Step 3: Cross multiply
   1,123.07x = 1,549.76 × 680.85
4. Step 4: Simplify right side
   1,123.07x = 1,055,150.69
5. Step 5: Solve for x
   x = 1,055,150.69/1,123.07
6. Step 6: Final answer
   x = 939.53