Finding the Fourth Proportional to 1,072.83, 1,480.86 and 630.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.83 : 1,480.86 = 630.86 : x
2. Step 2: Convert to fraction form
   1,072.83/1,480.86 = 630.86/x
3. Step 3: Cross multiply
   1,072.83x = 1,480.86 × 630.86
4. Step 4: Simplify right side
   1,072.83x = 934,215.34
5. Step 5: Solve for x
   x = 934,215.34/1,072.83
6. Step 6: Final answer
   x = 870.80