Finding the Fourth Proportional to 20,742.22, 31,086.69 and 12,426.94

Step by Step Solution

1. Step 1: Write the proportion equation
   20,742.22 : 31,086.69 = 12,426.94 : x
2. Step 2: Convert to fraction form
   20,742.22/31,086.69 = 12,426.94/x
3. Step 3: Cross multiply
   20,742.22x = 31,086.69 × 12,426.94
4. Step 4: Simplify right side
   20,742.22x = 386,312,431.43
5. Step 5: Solve for x
   x = 386,312,431.43/20,742.22
6. Step 6: Final answer
   x = 18,624.45