Finding the Fourth Proportional to 1,234.72, 1,704.06 and 710.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,234.72 : 1,704.06 = 710.80 : x
2. Step 2: Convert to fraction form
   1,234.72/1,704.06 = 710.80/x
3. Step 3: Cross multiply
   1,234.72x = 1,704.06 × 710.80
4. Step 4: Simplify right side
   1,234.72x = 1,211,245.85
5. Step 5: Solve for x
   x = 1,211,245.85/1,234.72
6. Step 6: Final answer
   x = 980.99