Finding the Fourth Proportional to 51,756.40, 71,429.78 and 28,788.54

Step by Step Solution

1. Step 1: Write the proportion equation
   51,756.40 : 71,429.78 = 28,788.54 : x
2. Step 2: Convert to fraction form
   51,756.40/71,429.78 = 28,788.54/x
3. Step 3: Cross multiply
   51,756.40x = 71,429.78 × 28,788.54
4. Step 4: Simplify right side
   51,756.40x = 2,056,359,078.72
5. Step 5: Solve for x
   x = 2,056,359,078.72/51,756.40
6. Step 6: Final answer
   x = 39,731.49