Finding the Fourth Proportional to 1,023.38, 1,411.86 and 629.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,023.38 : 1,411.86 = 629.72 : x
2. Step 2: Convert to fraction form
   1,023.38/1,411.86 = 629.72/x
3. Step 3: Cross multiply
   1,023.38x = 1,411.86 × 629.72
4. Step 4: Simplify right side
   1,023.38x = 889,076.48
5. Step 5: Solve for x
   x = 889,076.48/1,023.38
6. Step 6: Final answer
   x = 868.76