Finding the Fourth Proportional to 1,071.38, 1,478.72 and 629.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.38 : 1,478.72 = 629.43 : x
2. Step 2: Convert to fraction form
   1,071.38/1,478.72 = 629.43/x
3. Step 3: Cross multiply
   1,071.38x = 1,478.72 × 629.43
4. Step 4: Simplify right side
   1,071.38x = 930,746.76
5. Step 5: Solve for x
   x = 930,746.76/1,071.38
6. Step 6: Final answer
   x = 868.73