Finding the Fourth Proportional to 81,115.43, 111,904.47 and 50,880.15

Step by Step Solution

1. Step 1: Write the proportion equation
   81,115.43 : 111,904.47 = 50,880.15 : x
2. Step 2: Convert to fraction form
   81,115.43/111,904.47 = 50,880.15/x
3. Step 3: Cross multiply
   81,115.43x = 111,904.47 × 50,880.15
4. Step 4: Simplify right side
   81,115.43x = 5,693,716,219.27
5. Step 5: Solve for x
   x = 5,693,716,219.27/81,115.43
6. Step 6: Final answer
   x = 70,192.77