Finding the Fourth Proportional to 51,208.20, 76,806.72 and 16,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   51,208.20 : 76,806.72 = 16,128.72 : x
2. Step 2: Convert to fraction form
   51,208.20/76,806.72 = 16,128.72/x
3. Step 3: Cross multiply
   51,208.20x = 76,806.72 × 16,128.72
4. Step 4: Simplify right side
   51,208.20x = 1,238,794,081.00
5. Step 5: Solve for x
   x = 1,238,794,081.00/51,208.20
6. Step 6: Final answer
   x = 24,191.32