Finding the Fourth Proportional to 906.59, 1,250.61 and 685.16

Step by Step Solution

1. Step 1: Write the proportion equation
   906.59 : 1,250.61 = 685.16 : x
2. Step 2: Convert to fraction form
   906.59/1,250.61 = 685.16/x
3. Step 3: Cross multiply
   906.59x = 1,250.61 × 685.16
4. Step 4: Simplify right side
   906.59x = 856,861.69
5. Step 5: Solve for x
   x = 856,861.69/906.59
6. Step 6: Final answer
   x = 945.15