Finding the Fourth Proportional to 39,633.83, 54,693.25 and 21,728.47

Step by Step Solution

1. Step 1: Write the proportion equation
   39,633.83 : 54,693.25 = 21,728.47 : x
2. Step 2: Convert to fraction form
   39,633.83/54,693.25 = 21,728.47/x
3. Step 3: Cross multiply
   39,633.83x = 54,693.25 × 21,728.47
4. Step 4: Simplify right side
   39,633.83x = 1,188,400,641.83
5. Step 5: Solve for x
   x = 1,188,400,641.83/39,633.83
6. Step 6: Final answer
   x = 29,984.50