Finding the Fourth Proportional to 21,359.22, 29,473.70 and 12,406.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,359.22 : 29,473.70 = 12,406.49 : x
2. Step 2: Convert to fraction form
   21,359.22/29,473.70 = 12,406.49/x
3. Step 3: Cross multiply
   21,359.22x = 29,473.70 × 12,406.49
4. Step 4: Simplify right side
   21,359.22x = 365,665,164.31
5. Step 5: Solve for x
   x = 365,665,164.31/21,359.22
6. Step 6: Final answer
   x = 17,119.78