Finding the Fourth Proportional to 72,035.81, 99,418.82 and 40,211.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72,035.81 : 99,418.82 = 40,211.31 : x
2. Step 2: Convert to fraction form
   72,035.81/99,418.82 = 40,211.31/x
3. Step 3: Cross multiply
   72,035.81x = 99,418.82 × 40,211.31
4. Step 4: Simplify right side
   72,035.81x = 3,997,760,789.80
5. Step 5: Solve for x
   x = 3,997,760,789.80/72,035.81
6. Step 6: Final answer
   x = 55,496.86