Finding the Fourth Proportional to 72,021.33, 99,394.43 and 40,196.43

Step by Step Solution

1. Step 1: Write the proportion equation
   72,021.33 : 99,394.43 = 40,196.43 : x
2. Step 2: Convert to fraction form
   72,021.33/99,394.43 = 40,196.43/x
3. Step 3: Cross multiply
   72,021.33x = 99,394.43 × 40,196.43
4. Step 4: Simplify right side
   72,021.33x = 3,995,301,046.90
5. Step 5: Solve for x
   x = 3,995,301,046.90/72,021.33
6. Step 6: Final answer
   x = 55,473.86