Finding the Fourth Proportional to 1,072.63, 1,479.43 and 630.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.63 : 1,479.43 = 630.07 : x
2. Step 2: Convert to fraction form
   1,072.63/1,479.43 = 630.07/x
3. Step 3: Cross multiply
   1,072.63x = 1,479.43 × 630.07
4. Step 4: Simplify right side
   1,072.63x = 932,144.46
5. Step 5: Solve for x
   x = 932,144.46/1,072.63
6. Step 6: Final answer
   x = 869.03