Finding the Fourth Proportional to 40,350.50, 60,535.47 and 12,648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   40,350.50 : 60,535.47 = 12,648.50 : x
2. Step 2: Convert to fraction form
   40,350.50/60,535.47 = 12,648.50/x
3. Step 3: Cross multiply
   40,350.50x = 60,535.47 × 12,648.50
4. Step 4: Simplify right side
   40,350.50x = 765,682,892.30
5. Step 5: Solve for x
   x = 765,682,892.30/40,350.50
6. Step 6: Final answer
   x = 18,975.80