Finding the Fourth Proportional to 2,648.19, 3,972.75 and 1,089.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.19 : 3,972.75 = 1,089.05 : x
2. Step 2: Convert to fraction form
   2,648.19/3,972.75 = 1,089.05/x
3. Step 3: Cross multiply
   2,648.19x = 3,972.75 × 1,089.05
4. Step 4: Simplify right side
   2,648.19x = 4,326,499.44
5. Step 5: Solve for x
   x = 4,326,499.44/2,648.19
6. Step 6: Final answer
   x = 1,633.75