Finding the Fourth Proportional to 86,287.69, 129,469.23 and 30,168.09

Step by Step Solution

1. Step 1: Write the proportion equation
   86,287.69 : 129,469.23 = 30,168.09 : x
2. Step 2: Convert to fraction form
   86,287.69/129,469.23 = 30,168.09/x
3. Step 3: Cross multiply
   86,287.69x = 129,469.23 × 30,168.09
4. Step 4: Simplify right side
   86,287.69x = 3,905,839,382.87
5. Step 5: Solve for x
   x = 3,905,839,382.87/86,287.69
6. Step 6: Final answer
   x = 45,265.31