Finding the Fourth Proportional to 1,144.61, 1,578.01 and 724.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.61 : 1,578.01 = 724.76 : x
2. Step 2: Convert to fraction form
   1,144.61/1,578.01 = 724.76/x
3. Step 3: Cross multiply
   1,144.61x = 1,578.01 × 724.76
4. Step 4: Simplify right side
   1,144.61x = 1,143,669.63
5. Step 5: Solve for x
   x = 1,143,669.63/1,144.61
6. Step 6: Final answer
   x = 999.17