Finding the Fourth Proportional to 72,920.52, 109,371.56 and 28,578.41

Step by Step Solution

1. Step 1: Write the proportion equation
   72,920.52 : 109,371.56 = 28,578.41 : x
2. Step 2: Convert to fraction form
   72,920.52/109,371.56 = 28,578.41/x
3. Step 3: Cross multiply
   72,920.52x = 109,371.56 × 28,578.41
4. Step 4: Simplify right side
   72,920.52x = 3,125,665,414.56
5. Step 5: Solve for x
   x = 3,125,665,414.56/72,920.52
6. Step 6: Final answer
   x = 42,864.00