Finding the Fourth Proportional to 1,122.55, 1,684.83 and 712.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,122.55 : 1,684.83 = 712.42 : x
2. Step 2: Convert to fraction form
   1,122.55/1,684.83 = 712.42/x
3. Step 3: Cross multiply
   1,122.55x = 1,684.83 × 712.42
4. Step 4: Simplify right side
   1,122.55x = 1,200,306.59
5. Step 5: Solve for x
   x = 1,200,306.59/1,122.55
6. Step 6: Final answer
   x = 1,069.27