Finding the Fourth Proportional to 39,789.81, 54,910.37 and 21,884.96

Step by Step Solution

1. Step 1: Write the proportion equation
   39,789.81 : 54,910.37 = 21,884.96 : x
2. Step 2: Convert to fraction form
   39,789.81/54,910.37 = 21,884.96/x
3. Step 3: Cross multiply
   39,789.81x = 54,910.37 × 21,884.96
4. Step 4: Simplify right side
   39,789.81x = 1,201,711,443.02
5. Step 5: Solve for x
   x = 1,201,711,443.02/39,789.81
6. Step 6: Final answer
   x = 30,201.49