Finding the Fourth Proportional to 72,039.69, 99,411.57 and 40,207.86

Step by Step Solution

1. Step 1: Write the proportion equation
   72,039.69 : 99,411.57 = 40,207.86 : x
2. Step 2: Convert to fraction form
   72,039.69/99,411.57 = 40,207.86/x
3. Step 3: Cross multiply
   72,039.69x = 99,411.57 × 40,207.86
4. Step 4: Simplify right side
   72,039.69x = 3,997,126,488.94
5. Step 5: Solve for x
   x = 3,997,126,488.94/72,039.69
6. Step 6: Final answer
   x = 55,485.06