Finding the Fourth Proportional to 72,665.15, 108,953.12 and 28,240.03

Step by Step Solution

1. Step 1: Write the proportion equation
   72,665.15 : 108,953.12 = 28,240.03 : x
2. Step 2: Convert to fraction form
   72,665.15/108,953.12 = 28,240.03/x
3. Step 3: Cross multiply
   72,665.15x = 108,953.12 × 28,240.03
4. Step 4: Simplify right side
   72,665.15x = 3,076,839,377.39
5. Step 5: Solve for x
   x = 3,076,839,377.39/72,665.15
6. Step 6: Final answer
   x = 42,342.71