Finding the Fourth Proportional to 1,180.27, 1,628.78 and 656.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,180.27 : 1,628.78 = 656.31 : x
2. Step 2: Convert to fraction form
   1,180.27/1,628.78 = 656.31/x
3. Step 3: Cross multiply
   1,180.27x = 1,628.78 × 656.31
4. Step 4: Simplify right side
   1,180.27x = 1,068,976.68
5. Step 5: Solve for x
   x = 1,068,976.68/1,180.27
6. Step 6: Final answer
   x = 905.70