Finding the Fourth Proportional to 1,072.52, 1,480.56 and 630.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.52 : 1,480.56 = 630.45 : x
2. Step 2: Convert to fraction form
   1,072.52/1,480.56 = 630.45/x
3. Step 3: Cross multiply
   1,072.52x = 1,480.56 × 630.45
4. Step 4: Simplify right side
   1,072.52x = 933,419.05
5. Step 5: Solve for x
   x = 933,419.05/1,072.52
6. Step 6: Final answer
   x = 870.31