Finding the Fourth Proportional to 1,019.81, 1,405.46 and 724.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.81 : 1,405.46 = 724.97 : x
2. Step 2: Convert to fraction form
   1,019.81/1,405.46 = 724.97/x
3. Step 3: Cross multiply
   1,019.81x = 1,405.46 × 724.97
4. Step 4: Simplify right side
   1,019.81x = 1,018,916.34
5. Step 5: Solve for x
   x = 1,018,916.34/1,019.81
6. Step 6: Final answer
   x = 999.12