Finding the Fourth Proportional to 1,215.69, 1,822.22 and 484.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.69 : 1,822.22 = 484.89 : x
2. Step 2: Convert to fraction form
   1,215.69/1,822.22 = 484.89/x
3. Step 3: Cross multiply
   1,215.69x = 1,822.22 × 484.89
4. Step 4: Simplify right side
   1,215.69x = 883,573.83
5. Step 5: Solve for x
   x = 883,573.83/1,215.69
6. Step 6: Final answer
   x = 726.81