Finding the Fourth Proportional to 1,859.15, 2,568.41 and 1,222.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,859.15 : 2,568.41 = 1,222.61 : x
2. Step 2: Convert to fraction form
   1,859.15/2,568.41 = 1,222.61/x
3. Step 3: Cross multiply
   1,859.15x = 2,568.41 × 1,222.61
4. Step 4: Simplify right side
   1,859.15x = 3,140,144.80
5. Step 5: Solve for x
   x = 3,140,144.80/1,859.15
6. Step 6: Final answer
   x = 1,689.03