Finding the Fourth Proportional to 39,931.80, 55,105.20 and 22,028.52

Step by Step Solution

1. Step 1: Write the proportion equation
   39,931.80 : 55,105.20 = 22,028.52 : x
2. Step 2: Convert to fraction form
   39,931.80/55,105.20 = 22,028.52/x
3. Step 3: Cross multiply
   39,931.80x = 55,105.20 × 22,028.52
4. Step 4: Simplify right side
   39,931.80x = 1,213,886,000.30
5. Step 5: Solve for x
   x = 1,213,886,000.30/39,931.80
6. Step 6: Final answer
   x = 30,398.98