Finding the Fourth Proportional to 1,072.54, 1,479.72 and 630.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.54 : 1,479.72 = 630.28 : x
2. Step 2: Convert to fraction form
   1,072.54/1,479.72 = 630.28/x
3. Step 3: Cross multiply
   1,072.54x = 1,479.72 × 630.28
4. Step 4: Simplify right side
   1,072.54x = 932,637.92
5. Step 5: Solve for x
   x = 932,637.92/1,072.54
6. Step 6: Final answer
   x = 869.56