Finding the Fourth Proportional to 1,145.34, 1,579.94 and 724.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.34 : 1,579.94 = 724.92 : x
2. Step 2: Convert to fraction form
   1,145.34/1,579.94 = 724.92/x
3. Step 3: Cross multiply
   1,145.34x = 1,579.94 × 724.92
4. Step 4: Simplify right side
   1,145.34x = 1,145,330.10
5. Step 5: Solve for x
   x = 1,145,330.10/1,145.34
6. Step 6: Final answer
   x = 999.99