Finding the Fourth Proportional to 39,665.86, 54,738.68 and 21,760.42

Step by Step Solution

1. Step 1: Write the proportion equation
   39,665.86 : 54,738.68 = 21,760.42 : x
2. Step 2: Convert to fraction form
   39,665.86/54,738.68 = 21,760.42/x
3. Step 3: Cross multiply
   39,665.86x = 54,738.68 × 21,760.42
4. Step 4: Simplify right side
   39,665.86x = 1,191,136,667.05
5. Step 5: Solve for x
   x = 1,191,136,667.05/39,665.86
6. Step 6: Final answer
   x = 30,029.27