Finding the Fourth Proportional to 1,636.72, 2,441.25 and 1,390.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.72 : 2,441.25 = 1,390.48 : x
2. Step 2: Convert to fraction form
   1,636.72/2,441.25 = 1,390.48/x
3. Step 3: Cross multiply
   1,636.72x = 2,441.25 × 1,390.48
4. Step 4: Simplify right side
   1,636.72x = 3,394,509.30
5. Step 5: Solve for x
   x = 3,394,509.30/1,636.72
6. Step 6: Final answer
   x = 2,073.97