Finding the Fourth Proportional to 78,789.20, 108,765.86 and 50,511.04

Step by Step Solution

1. Step 1: Write the proportion equation
   78,789.20 : 108,765.86 = 50,511.04 : x
2. Step 2: Convert to fraction form
   78,789.20/108,765.86 = 50,511.04/x
3. Step 3: Cross multiply
   78,789.20x = 108,765.86 × 50,511.04
4. Step 4: Simplify right side
   78,789.20x = 5,493,876,705.09
5. Step 5: Solve for x
   x = 5,493,876,705.09/78,789.20
6. Step 6: Final answer
   x = 69,728.80