Finding the Fourth Proportional to 20,066.79, 27,678.42 and 13,768.23

Step by Step Solution

1. Step 1: Write the proportion equation
   20,066.79 : 27,678.42 = 13,768.23 : x
2. Step 2: Convert to fraction form
   20,066.79/27,678.42 = 13,768.23/x
3. Step 3: Cross multiply
   20,066.79x = 27,678.42 × 13,768.23
4. Step 4: Simplify right side
   20,066.79x = 381,082,852.60
5. Step 5: Solve for x
   x = 381,082,852.60/20,066.79
6. Step 6: Final answer
   x = 18,990.72