Finding the Fourth Proportional to 20,643.31, 30,888.42 and 12,327.85

Step by Step Solution

1. Step 1: Write the proportion equation
   20,643.31 : 30,888.42 = 12,327.85 : x
2. Step 2: Convert to fraction form
   20,643.31/30,888.42 = 12,327.85/x
3. Step 3: Cross multiply
   20,643.31x = 30,888.42 × 12,327.85
4. Step 4: Simplify right side
   20,643.31x = 380,787,808.50
5. Step 5: Solve for x
   x = 380,787,808.50/20,643.31
6. Step 6: Final answer
   x = 18,446.06