Finding the Fourth Proportional to 72,238.50, 99,693.55 and 40,409.54

Step by Step Solution

1. Step 1: Write the proportion equation
   72,238.50 : 99,693.55 = 40,409.54 : x
2. Step 2: Convert to fraction form
   72,238.50/99,693.55 = 40,409.54/x
3. Step 3: Cross multiply
   72,238.50x = 99,693.55 × 40,409.54
4. Step 4: Simplify right side
   72,238.50x = 4,028,570,496.47
5. Step 5: Solve for x
   x = 4,028,570,496.47/72,238.50
6. Step 6: Final answer
   x = 55,767.64