Finding the Fourth Proportional to 1,443.90, 2,164.05 and 663.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.90 : 2,164.05 = 663.07 : x
2. Step 2: Convert to fraction form
   1,443.90/2,164.05 = 663.07/x
3. Step 3: Cross multiply
   1,443.90x = 2,164.05 × 663.07
4. Step 4: Simplify right side
   1,443.90x = 1,434,912.27
5. Step 5: Solve for x
   x = 1,434,912.27/1,443.90
6. Step 6: Final answer
   x = 993.78