Finding the Fourth Proportional to 1,242.80, 1,854.89 and 1,222.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.80 : 1,854.89 = 1,222.29 : x
2. Step 2: Convert to fraction form
   1,242.80/1,854.89 = 1,222.29/x
3. Step 3: Cross multiply
   1,242.80x = 1,854.89 × 1,222.29
4. Step 4: Simplify right side
   1,242.80x = 2,267,207.39
5. Step 5: Solve for x
   x = 2,267,207.39/1,242.80
6. Step 6: Final answer
   x = 1,824.28