Finding the Fourth Proportional to 20,340.86, 30,461.61 and 12,538.94

Step by Step Solution

1. Step 1: Write the proportion equation
   20,340.86 : 30,461.61 = 12,538.94 : x
2. Step 2: Convert to fraction form
   20,340.86/30,461.61 = 12,538.94/x
3. Step 3: Cross multiply
   20,340.86x = 30,461.61 × 12,538.94
4. Step 4: Simplify right side
   20,340.86x = 381,956,300.09
5. Step 5: Solve for x
   x = 381,956,300.09/20,340.86
6. Step 6: Final answer
   x = 18,777.79