Finding the Fourth Proportional to 2,648, 3,972 and 1,109

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648 : 3,972 = 1,109 : x
2. Step 2: Convert to fraction form
   2,648/3,972 = 1,109/x
3. Step 3: Cross multiply
   2,648x = 3,972 × 1,109
4. Step 4: Simplify right side
   2,648x = 4,404,948
5. Step 5: Solve for x
   x = 4,404,948/2,648
6. Step 6: Final answer
   x = 1,663.50