Finding the Fourth Proportional to 39,724.03, 54,820.56 and 21,820.69

Step by Step Solution

1. Step 1: Write the proportion equation
   39,724.03 : 54,820.56 = 21,820.69 : x
2. Step 2: Convert to fraction form
   39,724.03/54,820.56 = 21,820.69/x
3. Step 3: Cross multiply
   39,724.03x = 54,820.56 × 21,820.69
4. Step 4: Simplify right side
   39,724.03x = 1,196,222,445.39
5. Step 5: Solve for x
   x = 1,196,222,445.39/39,724.03
6. Step 6: Final answer
   x = 30,113.32