Finding the Fourth Proportional to 1,158.78, 1,597.45 and 716.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.78 : 1,597.45 = 716.43 : x
2. Step 2: Convert to fraction form
   1,158.78/1,597.45 = 716.43/x
3. Step 3: Cross multiply
   1,158.78x = 1,597.45 × 716.43
4. Step 4: Simplify right side
   1,158.78x = 1,144,461.10
5. Step 5: Solve for x
   x = 1,144,461.10/1,158.78
6. Step 6: Final answer
   x = 987.64