Finding the Fourth Proportional to 71,981.69, 99,334.89 and 40,152.65

Step by Step Solution

1. Step 1: Write the proportion equation
   71,981.69 : 99,334.89 = 40,152.65 : x
2. Step 2: Convert to fraction form
   71,981.69/99,334.89 = 40,152.65/x
3. Step 3: Cross multiply
   71,981.69x = 99,334.89 × 40,152.65
4. Step 4: Simplify right side
   71,981.69x = 3,988,558,574.28
5. Step 5: Solve for x
   x = 3,988,558,574.28/71,981.69
6. Step 6: Final answer
   x = 55,410.74