Finding the Fourth Proportional to 2,427.72, 3,644.38 and 1,391.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,427.72 : 3,644.38 = 1,391.64 : x
2. Step 2: Convert to fraction form
   2,427.72/3,644.38 = 1,391.64/x
3. Step 3: Cross multiply
   2,427.72x = 3,644.38 × 1,391.64
4. Step 4: Simplify right side
   2,427.72x = 5,071,664.98
5. Step 5: Solve for x
   x = 5,071,664.98/2,427.72
6. Step 6: Final answer
   x = 2,089.07