Finding the Fourth Proportional to 39,769.98, 54,882.61 and 21,865.29

Step by Step Solution

1. Step 1: Write the proportion equation
   39,769.98 : 54,882.61 = 21,865.29 : x
2. Step 2: Convert to fraction form
   39,769.98/54,882.61 = 21,865.29/x
3. Step 3: Cross multiply
   39,769.98x = 54,882.61 × 21,865.29
4. Step 4: Simplify right side
   39,769.98x = 1,200,024,183.61
5. Step 5: Solve for x
   x = 1,200,024,183.61/39,769.98
6. Step 6: Final answer
   x = 30,174.12