Finding the Fourth Proportional to 21,769.72, 30,042.57 and 12,338.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,769.72 : 30,042.57 = 12,338.08 : x
2. Step 2: Convert to fraction form
   21,769.72/30,042.57 = 12,338.08/x
3. Step 3: Cross multiply
   21,769.72x = 30,042.57 × 12,338.08
4. Step 4: Simplify right side
   21,769.72x = 370,667,632.07
5. Step 5: Solve for x
   x = 370,667,632.07/21,769.72
6. Step 6: Final answer
   x = 17,026.75