Finding the Fourth Proportional to 72,042.16, 99,406.29 and 40,211.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,042.16 : 99,406.29 = 40,211.05 : x
2. Step 2: Convert to fraction form
   72,042.16/99,406.29 = 40,211.05/x
3. Step 3: Cross multiply
   72,042.16x = 99,406.29 × 40,211.05
4. Step 4: Simplify right side
   72,042.16x = 3,997,231,297.50
5. Step 5: Solve for x
   x = 3,997,231,297.50/72,042.16
6. Step 6: Final answer
   x = 55,484.61