Finding the Fourth Proportional to 1,142.91, 1,577.61 and 724.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.91 : 1,577.61 = 724.01 : x
2. Step 2: Convert to fraction form
   1,142.91/1,577.61 = 724.01/x
3. Step 3: Cross multiply
   1,142.91x = 1,577.61 × 724.01
4. Step 4: Simplify right side
   1,142.91x = 1,142,197.53
5. Step 5: Solve for x
   x = 1,142,197.53/1,142.91
6. Step 6: Final answer
   x = 999.38