Finding the Fourth Proportional to 1,071.34, 1,478.30 and 629.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.34 : 1,478.30 = 629.48 : x
2. Step 2: Convert to fraction form
   1,071.34/1,478.30 = 629.48/x
3. Step 3: Cross multiply
   1,071.34x = 1,478.30 × 629.48
4. Step 4: Simplify right side
   1,071.34x = 930,560.28
5. Step 5: Solve for x
   x = 930,560.28/1,071.34
6. Step 6: Final answer
   x = 868.59