Finding the Fourth Proportional to 39,093.78, 53,949.50 and 21,188.78

Step by Step Solution

1. Step 1: Write the proportion equation
   39,093.78 : 53,949.50 = 21,188.78 : x
2. Step 2: Convert to fraction form
   39,093.78/53,949.50 = 21,188.78/x
3. Step 3: Cross multiply
   39,093.78x = 53,949.50 × 21,188.78
4. Step 4: Simplify right side
   39,093.78x = 1,143,124,086.61
5. Step 5: Solve for x
   x = 1,143,124,086.61/39,093.78
6. Step 6: Final answer
   x = 29,240.56