Finding the Fourth Proportional to 72,231.57, 99,684.78 and 40,410.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,231.57 : 99,684.78 = 40,410.72 : x
2. Step 2: Convert to fraction form
   72,231.57/99,684.78 = 40,410.72/x
3. Step 3: Cross multiply
   72,231.57x = 99,684.78 × 40,410.72
4. Step 4: Simplify right side
   72,231.57x = 4,028,333,732.84
5. Step 5: Solve for x
   x = 4,028,333,732.84/72,231.57
6. Step 6: Final answer
   x = 55,769.71