Finding the Fourth Proportional to 39,185.73, 54,076.52 and 21,280.74

Step by Step Solution

1. Step 1: Write the proportion equation
   39,185.73 : 54,076.52 = 21,280.74 : x
2. Step 2: Convert to fraction form
   39,185.73/54,076.52 = 21,280.74/x
3. Step 3: Cross multiply
   39,185.73x = 54,076.52 × 21,280.74
4. Step 4: Simplify right side
   39,185.73x = 1,150,788,255.82
5. Step 5: Solve for x
   x = 1,150,788,255.82/39,185.73
6. Step 6: Final answer
   x = 29,367.53