Finding the Fourth Proportional to 1,072.47, 1,479.89 and 630.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.47 : 1,479.89 = 630.35 : x
2. Step 2: Convert to fraction form
   1,072.47/1,479.89 = 630.35/x
3. Step 3: Cross multiply
   1,072.47x = 1,479.89 × 630.35
4. Step 4: Simplify right side
   1,072.47x = 932,838.11
5. Step 5: Solve for x
   x = 932,838.11/1,072.47
6. Step 6: Final answer
   x = 869.80