Finding the Fourth Proportional to 72,040.43, 99,416.82 and 40,209.33

Step by Step Solution

1. Step 1: Write the proportion equation
   72,040.43 : 99,416.82 = 40,209.33 : x
2. Step 2: Convert to fraction form
   72,040.43/99,416.82 = 40,209.33/x
3. Step 3: Cross multiply
   72,040.43x = 99,416.82 × 40,209.33
4. Step 4: Simplify right side
   72,040.43x = 3,997,483,461.13
5. Step 5: Solve for x
   x = 3,997,483,461.13/72,040.43
6. Step 6: Final answer
   x = 55,489.45