Finding the Fourth Proportional to 1,123.29, 1,549.62 and 681.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.29 : 1,549.62 = 681.13 : x
2. Step 2: Convert to fraction form
   1,123.29/1,549.62 = 681.13/x
3. Step 3: Cross multiply
   1,123.29x = 1,549.62 × 681.13
4. Step 4: Simplify right side
   1,123.29x = 1,055,494.61
5. Step 5: Solve for x
   x = 1,055,494.61/1,123.29
6. Step 6: Final answer
   x = 939.65