Finding the Fourth Proportional to 72,933.50, 100,648.32 and 39,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,933.50 : 100,648.32 = 39,399.50 : x
2. Step 2: Convert to fraction form
   72,933.50/100,648.32 = 39,399.50/x
3. Step 3: Cross multiply
   72,933.50x = 100,648.32 × 39,399.50
4. Step 4: Simplify right side
   72,933.50x = 3,965,493,483.84
5. Step 5: Solve for x
   x = 3,965,493,483.84/72,933.50
6. Step 6: Final answer
   x = 54,371.36