Finding the Fourth Proportional to 1,616.25, 2,230.71 and 1,222.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,616.25 : 2,230.71 = 1,222.59 : x
2. Step 2: Convert to fraction form
   1,616.25/2,230.71 = 1,222.59/x
3. Step 3: Cross multiply
   1,616.25x = 2,230.71 × 1,222.59
4. Step 4: Simplify right side
   1,616.25x = 2,727,243.74
5. Step 5: Solve for x
   x = 2,727,243.74/1,616.25
6. Step 6: Final answer
   x = 1,687.39