Finding the Fourth Proportional to 72,636.71, 108,960.74 and 28,260.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,636.71 : 108,960.74 = 28,260.05 : x
2. Step 2: Convert to fraction form
   72,636.71/108,960.74 = 28,260.05/x
3. Step 3: Cross multiply
   72,636.71x = 108,960.74 × 28,260.05
4. Step 4: Simplify right side
   72,636.71x = 3,079,235,819.14
5. Step 5: Solve for x
   x = 3,079,235,819.14/72,636.71
6. Step 6: Final answer
   x = 42,392.28