Finding the Fourth Proportional to 1,613.50, 2,226.47 and 905.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.50 : 2,226.47 = 905.18 : x
2. Step 2: Convert to fraction form
   1,613.50/2,226.47 = 905.18/x
3. Step 3: Cross multiply
   1,613.50x = 2,226.47 × 905.18
4. Step 4: Simplify right side
   1,613.50x = 2,015,340.46
5. Step 5: Solve for x
   x = 2,015,340.46/1,613.50
6. Step 6: Final answer
   x = 1,249.05