Finding the Fourth Proportional to 2,072.18, 2,860.17 and 1,222.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.18 : 2,860.17 = 1,222.18 : x
2. Step 2: Convert to fraction form
   2,072.18/2,860.17 = 1,222.18/x
3. Step 3: Cross multiply
   2,072.18x = 2,860.17 × 1,222.18
4. Step 4: Simplify right side
   2,072.18x = 3,495,642.57
5. Step 5: Solve for x
   x = 3,495,642.57/2,072.18
6. Step 6: Final answer
   x = 1,686.94