Finding the Fourth Proportional to 1,072.22, 1,479.72 and 630.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.22 : 1,479.72 = 630.24 : x
2. Step 2: Convert to fraction form
   1,072.22/1,479.72 = 630.24/x
3. Step 3: Cross multiply
   1,072.22x = 1,479.72 × 630.24
4. Step 4: Simplify right side
   1,072.22x = 932,578.73
5. Step 5: Solve for x
   x = 932,578.73/1,072.22
6. Step 6: Final answer
   x = 869.76