Finding the Fourth Proportional to 1,123.90, 1,550.72 and 681.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.90 : 1,550.72 = 681.79 : x
2. Step 2: Convert to fraction form
   1,123.90/1,550.72 = 681.79/x
3. Step 3: Cross multiply
   1,123.90x = 1,550.72 × 681.79
4. Step 4: Simplify right side
   1,123.90x = 1,057,258.10
5. Step 5: Solve for x
   x = 1,057,258.10/1,123.90
6. Step 6: Final answer
   x = 940.71