Finding the Fourth Proportional to 53,919.69, 80,858.47 and 20,628.69

Step by Step Solution

1. Step 1: Write the proportion equation
   53,919.69 : 80,858.47 = 20,628.69 : x
2. Step 2: Convert to fraction form
   53,919.69/80,858.47 = 20,628.69/x
3. Step 3: Cross multiply
   53,919.69x = 80,858.47 × 20,628.69
4. Step 4: Simplify right side
   53,919.69x = 1,668,004,311.50
5. Step 5: Solve for x
   x = 1,668,004,311.50/53,919.69
6. Step 6: Final answer
   x = 30,934.98