Finding the Fourth Proportional to 39,722.49, 54,818.01 and 21,819.15

Step by Step Solution

1. Step 1: Write the proportion equation
   39,722.49 : 54,818.01 = 21,819.15 : x
2. Step 2: Convert to fraction form
   39,722.49/54,818.01 = 21,819.15/x
3. Step 3: Cross multiply
   39,722.49x = 54,818.01 × 21,819.15
4. Step 4: Simplify right side
   39,722.49x = 1,196,082,382.89
5. Step 5: Solve for x
   x = 1,196,082,382.89/39,722.49
6. Step 6: Final answer
   x = 30,110.96