Finding the Fourth Proportional to 39,820.06, 54,949.59 and 21,911.61

Step by Step Solution

1. Step 1: Write the proportion equation
   39,820.06 : 54,949.59 = 21,911.61 : x
2. Step 2: Convert to fraction form
   39,820.06/54,949.59 = 21,911.61/x
3. Step 3: Cross multiply
   39,820.06x = 54,949.59 × 21,911.61
4. Step 4: Simplify right side
   39,820.06x = 1,204,034,191.80
5. Step 5: Solve for x
   x = 1,204,034,191.80/39,820.06
6. Step 6: Final answer
   x = 30,236.88