Finding the Fourth Proportional to 1,617.37, 2,231.78 and 909.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,617.37 : 2,231.78 = 909.07 : x
2. Step 2: Convert to fraction form
   1,617.37/2,231.78 = 909.07/x
3. Step 3: Cross multiply
   1,617.37x = 2,231.78 × 909.07
4. Step 4: Simplify right side
   1,617.37x = 2,028,834.12
5. Step 5: Solve for x
   x = 2,028,834.12/1,617.37
6. Step 6: Final answer
   x = 1,254.41