Finding the Fourth Proportional to 1,072.49, 1,479.69 and 630.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.49 : 1,479.69 = 630.54 : x
2. Step 2: Convert to fraction form
   1,072.49/1,479.69 = 630.54/x
3. Step 3: Cross multiply
   1,072.49x = 1,479.69 × 630.54
4. Step 4: Simplify right side
   1,072.49x = 933,003.73
5. Step 5: Solve for x
   x = 933,003.73/1,072.49
6. Step 6: Final answer
   x = 869.95