Finding the Fourth Proportional to 1,123.86, 1,550.48 and 681.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.86 : 1,550.48 = 681.00 : x
2. Step 2: Convert to fraction form
   1,123.86/1,550.48 = 681.00/x
3. Step 3: Cross multiply
   1,123.86x = 1,550.48 × 681.00
4. Step 4: Simplify right side
   1,123.86x = 1,055,865.72
5. Step 5: Solve for x
   x = 1,055,865.72/1,123.86
6. Step 6: Final answer
   x = 939.50