Finding the Fourth Proportional to 39,942.72, 55,123.20 and 22,041.60

Step by Step Solution

1. Step 1: Write the proportion equation
   39,942.72 : 55,123.20 = 22,041.60 : x
2. Step 2: Convert to fraction form
   39,942.72/55,123.20 = 22,041.60/x
3. Step 3: Cross multiply
   39,942.72x = 55,123.20 × 22,041.60
4. Step 4: Simplify right side
   39,942.72x = 1,215,003,525.12
5. Step 5: Solve for x
   x = 1,215,003,525.12/39,942.72
6. Step 6: Final answer
   x = 30,418.65