Finding the Fourth Proportional to 2,109.60, 3,162.47 and 1,327.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.60 : 3,162.47 = 1,327.23 : x
2. Step 2: Convert to fraction form
   2,109.60/3,162.47 = 1,327.23/x
3. Step 3: Cross multiply
   2,109.60x = 3,162.47 × 1,327.23
4. Step 4: Simplify right side
   2,109.60x = 4,197,318.42
5. Step 5: Solve for x
   x = 4,197,318.42/2,109.60
6. Step 6: Final answer
   x = 1,989.63