Finding the Fourth Proportional to 1,123.54, 1,684.74 and 661.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.54 : 1,684.74 = 661.46 : x
2. Step 2: Convert to fraction form
   1,123.54/1,684.74 = 661.46/x
3. Step 3: Cross multiply
   1,123.54x = 1,684.74 × 661.46
4. Step 4: Simplify right side
   1,123.54x = 1,114,388.12
5. Step 5: Solve for x
   x = 1,114,388.12/1,123.54
6. Step 6: Final answer
   x = 991.85