Finding the Fourth Proportional to 53,854.12, 80,788.86 and 16,921

Step by Step Solution

1. Step 1: Write the proportion equation
   53,854.12 : 80,788.86 = 16,921 : x
2. Step 2: Convert to fraction form
   53,854.12/80,788.86 = 16,921/x
3. Step 3: Cross multiply
   53,854.12x = 80,788.86 × 16,921
4. Step 4: Simplify right side
   53,854.12x = 1,367,028,300.06
5. Step 5: Solve for x
   x = 1,367,028,300.06/53,854.12
6. Step 6: Final answer
   x = 25,383.91