Finding the Fourth Proportional to 1,123.55, 1,686.33 and 713.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.55 : 1,686.33 = 713.42 : x
2. Step 2: Convert to fraction form
   1,123.55/1,686.33 = 713.42/x
3. Step 3: Cross multiply
   1,123.55x = 1,686.33 × 713.42
4. Step 4: Simplify right side
   1,123.55x = 1,203,061.55
5. Step 5: Solve for x
   x = 1,203,061.55/1,123.55
6. Step 6: Final answer
   x = 1,070.77