Finding the Fourth Proportional to 51,216.72, 76,828.12 and 14,280.72

Step by Step Solution

1. Step 1: Write the proportion equation
   51,216.72 : 76,828.12 = 14,280.72 : x
2. Step 2: Convert to fraction form
   51,216.72/76,828.12 = 14,280.72/x
3. Step 3: Cross multiply
   51,216.72x = 76,828.12 × 14,280.72
4. Step 4: Simplify right side
   51,216.72x = 1,097,160,869.85
5. Step 5: Solve for x
   x = 1,097,160,869.85/51,216.72
6. Step 6: Final answer
   x = 21,421.93