Finding the Fourth Proportional to 1,022.72, 1,410.84 and 629.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.72 : 1,410.84 = 629.12 : x
2. Step 2: Convert to fraction form
   1,022.72/1,410.84 = 629.12/x
3. Step 3: Cross multiply
   1,022.72x = 1,410.84 × 629.12
4. Step 4: Simplify right side
   1,022.72x = 887,587.66
5. Step 5: Solve for x
   x = 887,587.66/1,022.72
6. Step 6: Final answer
   x = 867.87