Finding the Fourth Proportional to 1,157.71, 1,597.55 and 715.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,157.71 : 1,597.55 = 715.45 : x
2. Step 2: Convert to fraction form
   1,157.71/1,597.55 = 715.45/x
3. Step 3: Cross multiply
   1,157.71x = 1,597.55 × 715.45
4. Step 4: Simplify right side
   1,157.71x = 1,142,967.15
5. Step 5: Solve for x
   x = 1,142,967.15/1,157.71
6. Step 6: Final answer
   x = 987.27