Finding the Fourth Proportional to 1,021.67, 1,410.71 and 724.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,021.67 : 1,410.71 = 724.12 : x
2. Step 2: Convert to fraction form
   1,021.67/1,410.71 = 724.12/x
3. Step 3: Cross multiply
   1,021.67x = 1,410.71 × 724.12
4. Step 4: Simplify right side
   1,021.67x = 1,021,523.33
5. Step 5: Solve for x
   x = 1,021,523.33/1,021.67
6. Step 6: Final answer
   x = 999.86