Finding the Fourth Proportional to 1,123.64, 1,550.78 and 681.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.64 : 1,550.78 = 681.47 : x
2. Step 2: Convert to fraction form
   1,123.64/1,550.78 = 681.47/x
3. Step 3: Cross multiply
   1,123.64x = 1,550.78 × 681.47
4. Step 4: Simplify right side
   1,123.64x = 1,056,806.64
5. Step 5: Solve for x
   x = 1,056,806.64/1,123.64
6. Step 6: Final answer
   x = 940.52