Finding the Fourth Proportional to 1,073.16, 1,480.56 and 630.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,073.16 : 1,480.56 = 630.90 : x
2. Step 2: Convert to fraction form
   1,073.16/1,480.56 = 630.90/x
3. Step 3: Cross multiply
   1,073.16x = 1,480.56 × 630.90
4. Step 4: Simplify right side
   1,073.16x = 934,085.30
5. Step 5: Solve for x
   x = 934,085.30/1,073.16
6. Step 6: Final answer
   x = 870.41