Finding the Fourth Proportional to 1,072.88, 1,480.82 and 630.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.88 : 1,480.82 = 630.86 : x
2. Step 2: Convert to fraction form
   1,072.88/1,480.82 = 630.86/x
3. Step 3: Cross multiply
   1,072.88x = 1,480.82 × 630.86
4. Step 4: Simplify right side
   1,072.88x = 934,179.55
5. Step 5: Solve for x
   x = 934,179.55/1,072.88
6. Step 6: Final answer
   x = 870.72