Finding the Fourth Proportional to 72,493.80, 108,708.30 and 28,105.80

Step by Step Solution

1. Step 1: Write the proportion equation
   72,493.80 : 108,708.30 = 28,105.80 : x
2. Step 2: Convert to fraction form
   72,493.80/108,708.30 = 28,105.80/x
3. Step 3: Cross multiply
   72,493.80x = 108,708.30 × 28,105.80
4. Step 4: Simplify right side
   72,493.80x = 3,055,333,738.14
5. Step 5: Solve for x
   x = 3,055,333,738.14/72,493.80
6. Step 6: Final answer
   x = 42,146.14