Finding the Fourth Proportional to 1,408.24, 2,109.12 and 920.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.24 : 2,109.12 = 920.62 : x
2. Step 2: Convert to fraction form
   1,408.24/2,109.12 = 920.62/x
3. Step 3: Cross multiply
   1,408.24x = 2,109.12 × 920.62
4. Step 4: Simplify right side
   1,408.24x = 1,941,698.05
5. Step 5: Solve for x
   x = 1,941,698.05/1,408.24
6. Step 6: Final answer
   x = 1,378.81