Finding the Fourth Proportional to 1,071.37, 1,478.48 and 629.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.37 : 1,478.48 = 629.31 : x
2. Step 2: Convert to fraction form
   1,071.37/1,478.48 = 629.31/x
3. Step 3: Cross multiply
   1,071.37x = 1,478.48 × 629.31
4. Step 4: Simplify right side
   1,071.37x = 930,419.10
5. Step 5: Solve for x
   x = 930,419.10/1,071.37
6. Step 6: Final answer
   x = 868.44