Finding the Fourth Proportional to 1,123.62, 1,686.27 and 801.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.62 : 1,686.27 = 801.30 : x
2. Step 2: Convert to fraction form
   1,123.62/1,686.27 = 801.30/x
3. Step 3: Cross multiply
   1,123.62x = 1,686.27 × 801.30
4. Step 4: Simplify right side
   1,123.62x = 1,351,208.15
5. Step 5: Solve for x
   x = 1,351,208.15/1,123.62
6. Step 6: Final answer
   x = 1,202.55