Finding the Fourth Proportional to 72,617.80, 108,780.90 and 50,456.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,617.80 : 108,780.90 = 50,456.20 : x
2. Step 2: Convert to fraction form
   72,617.80/108,780.90 = 50,456.20/x
3. Step 3: Cross multiply
   72,617.80x = 108,780.90 × 50,456.20
4. Step 4: Simplify right side
   72,617.80x = 5,488,670,846.58
5. Step 5: Solve for x
   x = 5,488,670,846.58/72,617.80
6. Step 6: Final answer
   x = 75,583.00