Finding the Fourth Proportional to 1,123.61, 1,550.64 and 681.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.61 : 1,550.64 = 681.56 : x
2. Step 2: Convert to fraction form
   1,123.61/1,550.64 = 681.56/x
3. Step 3: Cross multiply
   1,123.61x = 1,550.64 × 681.56
4. Step 4: Simplify right side
   1,123.61x = 1,056,846.45
5. Step 5: Solve for x
   x = 1,056,846.45/1,123.61
6. Step 6: Final answer
   x = 940.59