Finding the Fourth Proportional to 39,726.20, 54,820.69 and 21,820.14

Step by Step Solution

1. Step 1: Write the proportion equation
   39,726.20 : 54,820.69 = 21,820.14 : x
2. Step 2: Convert to fraction form
   39,726.20/54,820.69 = 21,820.14/x
3. Step 3: Cross multiply
   39,726.20x = 54,820.69 × 21,820.14
4. Step 4: Simplify right side
   39,726.20x = 1,196,195,021.60
5. Step 5: Solve for x
   x = 1,196,195,021.60/39,726.20
6. Step 6: Final answer
   x = 30,110.99