Finding the Fourth Proportional to 1,020.22, 1,405.89 and 724.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.22 : 1,405.89 = 724.98 : x
2. Step 2: Convert to fraction form
   1,020.22/1,405.89 = 724.98/x
3. Step 3: Cross multiply
   1,020.22x = 1,405.89 × 724.98
4. Step 4: Simplify right side
   1,020.22x = 1,019,242.13
5. Step 5: Solve for x
   x = 1,019,242.13/1,020.22
6. Step 6: Final answer
   x = 999.04