Finding the Fourth Proportional to 50,009.64, 69,020.55 and 28,788.72

Step by Step Solution

1. Step 1: Write the proportion equation
   50,009.64 : 69,020.55 = 28,788.72 : x
2. Step 2: Convert to fraction form
   50,009.64/69,020.55 = 28,788.72/x
3. Step 3: Cross multiply
   50,009.64x = 69,020.55 × 28,788.72
4. Step 4: Simplify right side
   50,009.64x = 1,987,013,288.20
5. Step 5: Solve for x
   x = 1,987,013,288.20/50,009.64
6. Step 6: Final answer
   x = 39,732.61