Finding the Fourth Proportional to 1,158.10, 1,597.35 and 716.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.10 : 1,597.35 = 716.21 : x
2. Step 2: Convert to fraction form
   1,158.10/1,597.35 = 716.21/x
3. Step 3: Cross multiply
   1,158.10x = 1,597.35 × 716.21
4. Step 4: Simplify right side
   1,158.10x = 1,144,038.73
5. Step 5: Solve for x
   x = 1,144,038.73/1,158.10
6. Step 6: Final answer
   x = 987.86