Finding the Fourth Proportional to 81,399.72, 112,386.47 and 50,819.43

Step by Step Solution

1. Step 1: Write the proportion equation
   81,399.72 : 112,386.47 = 50,819.43 : x
2. Step 2: Convert to fraction form
   81,399.72/112,386.47 = 50,819.43/x
3. Step 3: Cross multiply
   81,399.72x = 112,386.47 × 50,819.43
4. Step 4: Simplify right side
   81,399.72x = 5,711,416,064.46
5. Step 5: Solve for x
   x = 5,711,416,064.46/81,399.72
6. Step 6: Final answer
   x = 70,165.06