Finding the Fourth Proportional to 1,071.42, 1,478.69 and 629.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.42 : 1,478.69 = 629.43 : x
2. Step 2: Convert to fraction form
   1,071.42/1,478.69 = 629.43/x
3. Step 3: Cross multiply
   1,071.42x = 1,478.69 × 629.43
4. Step 4: Simplify right side
   1,071.42x = 930,731.85
5. Step 5: Solve for x
   x = 930,731.85/1,071.42
6. Step 6: Final answer
   x = 868.69