Finding the Fourth Proportional to 1,123.32, 1,550.16 and 681.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.32 : 1,550.16 = 681.12 : x
2. Step 2: Convert to fraction form
   1,123.32/1,550.16 = 681.12/x
3. Step 3: Cross multiply
   1,123.32x = 1,550.16 × 681.12
4. Step 4: Simplify right side
   1,123.32x = 1,055,844.98
5. Step 5: Solve for x
   x = 1,055,844.98/1,123.32
6. Step 6: Final answer
   x = 939.93