Finding the Fourth Proportional to 39,665, 54,738.42 and 21,760.92

Step by Step Solution

1. Step 1: Write the proportion equation
   39,665 : 54,738.42 = 21,760.92 : x
2. Step 2: Convert to fraction form
   39,665/54,738.42 = 21,760.92/x
3. Step 3: Cross multiply
   39,665x = 54,738.42 × 21,760.92
4. Step 4: Simplify right side
   39,665x = 1,191,158,378.55
5. Step 5: Solve for x
   x = 1,191,158,378.55/39,665
6. Step 6: Final answer
   x = 30,030.46