Finding the Fourth Proportional to 1,022.78, 1,410.72 and 630.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.78 : 1,410.72 = 630.02 : x
2. Step 2: Convert to fraction form
   1,022.78/1,410.72 = 630.02/x
3. Step 3: Cross multiply
   1,022.78x = 1,410.72 × 630.02
4. Step 4: Simplify right side
   1,022.78x = 888,781.81
5. Step 5: Solve for x
   x = 888,781.81/1,022.78
6. Step 6: Final answer
   x = 868.99