Finding the Fourth Proportional to 72,487.71, 108,759.24 and 28,145.58

Step by Step Solution

1. Step 1: Write the proportion equation
   72,487.71 : 108,759.24 = 28,145.58 : x
2. Step 2: Convert to fraction form
   72,487.71/108,759.24 = 28,145.58/x
3. Step 3: Cross multiply
   72,487.71x = 108,759.24 × 28,145.58
4. Step 4: Simplify right side
   72,487.71x = 3,061,091,890.16
5. Step 5: Solve for x
   x = 3,061,091,890.16/72,487.71
6. Step 6: Final answer
   x = 42,229.12