Finding the Fourth Proportional to 1,158.18, 1,596.63 and 715.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.18 : 1,596.63 = 715.86 : x
2. Step 2: Convert to fraction form
   1,158.18/1,596.63 = 715.86/x
3. Step 3: Cross multiply
   1,158.18x = 1,596.63 × 715.86
4. Step 4: Simplify right side
   1,158.18x = 1,142,963.55
5. Step 5: Solve for x
   x = 1,142,963.55/1,158.18
6. Step 6: Final answer
   x = 986.86