Finding the Fourth Proportional to 1,120.46, 1,680.72 and 710.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.46 : 1,680.72 = 710.42 : x
2. Step 2: Convert to fraction form
   1,120.46/1,680.72 = 710.42/x
3. Step 3: Cross multiply
   1,120.46x = 1,680.72 × 710.42
4. Step 4: Simplify right side
   1,120.46x = 1,194,017.10
5. Step 5: Solve for x
   x = 1,194,017.10/1,120.46
6. Step 6: Final answer
   x = 1,065.65