Finding the Fourth Proportional to 1,157.55, 1,597.35 and 685.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,157.55 : 1,597.35 = 685.34 : x
2. Step 2: Convert to fraction form
   1,157.55/1,597.35 = 685.34/x
3. Step 3: Cross multiply
   1,157.55x = 1,597.35 × 685.34
4. Step 4: Simplify right side
   1,157.55x = 1,094,719.86
5. Step 5: Solve for x
   x = 1,094,719.86/1,157.55
6. Step 6: Final answer
   x = 945.72