Finding the Fourth Proportional to 1,072.73, 1,479.78 and 630.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.73 : 1,479.78 = 630.56 : x
2. Step 2: Convert to fraction form
   1,072.73/1,479.78 = 630.56/x
3. Step 3: Cross multiply
   1,072.73x = 1,479.78 × 630.56
4. Step 4: Simplify right side
   1,072.73x = 933,082.68
5. Step 5: Solve for x
   x = 933,082.68/1,072.73
6. Step 6: Final answer
   x = 869.82