Finding the Fourth Proportional to 1,157.88, 1,597.74 and 715.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,157.88 : 1,597.74 = 715.98 : x
2. Step 2: Convert to fraction form
   1,157.88/1,597.74 = 715.98/x
3. Step 3: Cross multiply
   1,157.88x = 1,597.74 × 715.98
4. Step 4: Simplify right side
   1,157.88x = 1,143,949.89
5. Step 5: Solve for x
   x = 1,143,949.89/1,157.88
6. Step 6: Final answer
   x = 987.97