Finding the Fourth Proportional to 1,613.68, 2,227.06 and 905.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.68 : 2,227.06 = 905.71 : x
2. Step 2: Convert to fraction form
   1,613.68/2,227.06 = 905.71/x
3. Step 3: Cross multiply
   1,613.68x = 2,227.06 × 905.71
4. Step 4: Simplify right side
   1,613.68x = 2,017,065.98
5. Step 5: Solve for x
   x = 2,017,065.98/1,613.68
6. Step 6: Final answer
   x = 1,249.98