Finding the Fourth Proportional to 39,872.72, 55,024.76 and 21,967.80

Step by Step Solution

1. Step 1: Write the proportion equation
   39,872.72 : 55,024.76 = 21,967.80 : x
2. Step 2: Convert to fraction form
   39,872.72/55,024.76 = 21,967.80/x
3. Step 3: Cross multiply
   39,872.72x = 55,024.76 × 21,967.80
4. Step 4: Simplify right side
   39,872.72x = 1,208,772,922.73
5. Step 5: Solve for x
   x = 1,208,772,922.73/39,872.72
6. Step 6: Final answer
   x = 30,315.79