Finding the Fourth Proportional to 1,616.39, 2,227.94 and 1,261.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,616.39 : 2,227.94 = 1,261.61 : x
2. Step 2: Convert to fraction form
   1,616.39/2,227.94 = 1,261.61/x
3. Step 3: Cross multiply
   1,616.39x = 2,227.94 × 1,261.61
4. Step 4: Simplify right side
   1,616.39x = 2,810,787.02
5. Step 5: Solve for x
   x = 2,810,787.02/1,616.39
6. Step 6: Final answer
   x = 1,738.93