Finding the Fourth Proportional to 72,309.53, 99,786.39 and 40,478.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72,309.53 : 99,786.39 = 40,478.69 : x
2. Step 2: Convert to fraction form
   72,309.53/99,786.39 = 40,478.69/x
3. Step 3: Cross multiply
   72,309.53x = 99,786.39 × 40,478.69
4. Step 4: Simplify right side
   72,309.53x = 4,039,222,347.03
5. Step 5: Solve for x
   x = 4,039,222,347.03/72,309.53
6. Step 6: Final answer
   x = 55,860.17