Finding the Fourth Proportional to 1,072.67, 1,480.53 and 630.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.67 : 1,480.53 = 630.71 : x
2. Step 2: Convert to fraction form
   1,072.67/1,480.53 = 630.71/x
3. Step 3: Cross multiply
   1,072.67x = 1,480.53 × 630.71
4. Step 4: Simplify right side
   1,072.67x = 933,777.67
5. Step 5: Solve for x
   x = 933,777.67/1,072.67
6. Step 6: Final answer
   x = 870.52