Finding the Fourth Proportional to 1,158.03, 1,598.40 and 715.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.03 : 1,598.40 = 715.77 : x
2. Step 2: Convert to fraction form
   1,158.03/1,598.40 = 715.77/x
3. Step 3: Cross multiply
   1,158.03x = 1,598.40 × 715.77
4. Step 4: Simplify right side
   1,158.03x = 1,144,086.77
5. Step 5: Solve for x
   x = 1,144,086.77/1,158.03
6. Step 6: Final answer
   x = 987.96