Finding the Fourth Proportional to 1,019.59, 1,405.06 and 724.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.59 : 1,405.06 = 724.35 : x
2. Step 2: Convert to fraction form
   1,019.59/1,405.06 = 724.35/x
3. Step 3: Cross multiply
   1,019.59x = 1,405.06 × 724.35
4. Step 4: Simplify right side
   1,019.59x = 1,017,751.57
5. Step 5: Solve for x
   x = 1,017,751.57/1,019.59
6. Step 6: Final answer
   x = 998.20