Finding the Fourth Proportional to 21,796.62, 32,665.77 and 12,439.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,796.62 : 32,665.77 = 12,439.50 : x
2. Step 2: Convert to fraction form
   21,796.62/32,665.77 = 12,439.50/x
3. Step 3: Cross multiply
   21,796.62x = 32,665.77 × 12,439.50
4. Step 4: Simplify right side
   21,796.62x = 406,345,845.92
5. Step 5: Solve for x
   x = 406,345,845.92/21,796.62
6. Step 6: Final answer
   x = 18,642.61