Finding the Fourth Proportional to 1,020.50, 1,408.29 and 710.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.50 : 1,408.29 = 710.18 : x
2. Step 2: Convert to fraction form
   1,020.50/1,408.29 = 710.18/x
3. Step 3: Cross multiply
   1,020.50x = 1,408.29 × 710.18
4. Step 4: Simplify right side
   1,020.50x = 1,000,139.39
5. Step 5: Solve for x
   x = 1,000,139.39/1,020.50
6. Step 6: Final answer
   x = 980.05