Finding the Fourth Proportional to 1,158.43, 1,598.19 and 715.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.43 : 1,598.19 = 715.57 : x
2. Step 2: Convert to fraction form
   1,158.43/1,598.19 = 715.57/x
3. Step 3: Cross multiply
   1,158.43x = 1,598.19 × 715.57
4. Step 4: Simplify right side
   1,158.43x = 1,143,616.82
5. Step 5: Solve for x
   x = 1,143,616.82/1,158.43
6. Step 6: Final answer
   x = 987.21