Finding the Fourth Proportional to 52,728.20, 72,764.91 and 28,854.87

Step by Step Solution

1. Step 1: Write the proportion equation
   52,728.20 : 72,764.91 = 28,854.87 : x
2. Step 2: Convert to fraction form
   52,728.20/72,764.91 = 28,854.87/x
3. Step 3: Cross multiply
   52,728.20x = 72,764.91 × 28,854.87
4. Step 4: Simplify right side
   52,728.20x = 2,099,622,018.61
5. Step 5: Solve for x
   x = 2,099,622,018.61/52,728.20
6. Step 6: Final answer
   x = 39,819.72