Finding the Fourth Proportional to 1,158.04, 1,597.16 and 715.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.04 : 1,597.16 = 715.78 : x
2. Step 2: Convert to fraction form
   1,158.04/1,597.16 = 715.78/x
3. Step 3: Cross multiply
   1,158.04x = 1,597.16 × 715.78
4. Step 4: Simplify right side
   1,158.04x = 1,143,215.18
5. Step 5: Solve for x
   x = 1,143,215.18/1,158.04
6. Step 6: Final answer
   x = 987.20