Finding the Fourth Proportional to 72,608.31, 108,870.18 and 28,183.17

Step by Step Solution

1. Step 1: Write the proportion equation
   72,608.31 : 108,870.18 = 28,183.17 : x
2. Step 2: Convert to fraction form
   72,608.31/108,870.18 = 28,183.17/x
3. Step 3: Cross multiply
   72,608.31x = 108,870.18 × 28,183.17
4. Step 4: Simplify right side
   72,608.31x = 3,068,306,790.87
5. Step 5: Solve for x
   x = 3,068,306,790.87/72,608.31
6. Step 6: Final answer
   x = 42,258.34