Finding the Fourth Proportional to 72,150.69, 99,567.78 and 40,319.59

Step by Step Solution

1. Step 1: Write the proportion equation
   72,150.69 : 99,567.78 = 40,319.59 : x
2. Step 2: Convert to fraction form
   72,150.69/99,567.78 = 40,319.59/x
3. Step 3: Cross multiply
   72,150.69x = 99,567.78 × 40,319.59
4. Step 4: Simplify right side
   72,150.69x = 4,014,532,066.81
5. Step 5: Solve for x
   x = 4,014,532,066.81/72,150.69
6. Step 6: Final answer
   x = 55,640.94