Finding the Fourth Proportional to 1,023.98, 1,412.78 and 630.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,023.98 : 1,412.78 = 630.72 : x
2. Step 2: Convert to fraction form
   1,023.98/1,412.78 = 630.72/x
3. Step 3: Cross multiply
   1,023.98x = 1,412.78 × 630.72
4. Step 4: Simplify right side
   1,023.98x = 891,065.45
5. Step 5: Solve for x
   x = 891,065.45/1,023.98
6. Step 6: Final answer
   x = 870.20