Finding the Fourth Proportional to 19,771.56, 29,662.20 and 13,939.56

Step by Step Solution

1. Step 1: Write the proportion equation
   19,771.56 : 29,662.20 = 13,939.56 : x
2. Step 2: Convert to fraction form
   19,771.56/29,662.20 = 13,939.56/x
3. Step 3: Cross multiply
   19,771.56x = 29,662.20 × 13,939.56
4. Step 4: Simplify right side
   19,771.56x = 413,478,016.63
5. Step 5: Solve for x
   x = 413,478,016.63/19,771.56
6. Step 6: Final answer
   x = 20,912.77