Finding the Fourth Proportional to 1,158.37, 1,598.10 and 715.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.37 : 1,598.10 = 715.50 : x
2. Step 2: Convert to fraction form
   1,158.37/1,598.10 = 715.50/x
3. Step 3: Cross multiply
   1,158.37x = 1,598.10 × 715.50
4. Step 4: Simplify right side
   1,158.37x = 1,143,440.55
5. Step 5: Solve for x
   x = 1,143,440.55/1,158.37
6. Step 6: Final answer
   x = 987.11