Finding the Fourth Proportional to 1,072.42, 1,479.44 and 630.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.42 : 1,479.44 = 630.31 : x
2. Step 2: Convert to fraction form
   1,072.42/1,479.44 = 630.31/x
3. Step 3: Cross multiply
   1,072.42x = 1,479.44 × 630.31
4. Step 4: Simplify right side
   1,072.42x = 932,505.83
5. Step 5: Solve for x
   x = 932,505.83/1,072.42
6. Step 6: Final answer
   x = 869.53