Finding the Fourth Proportional to 72,072.72, 108,021.33 and 51,018.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,072.72 : 108,021.33 = 51,018.72 : x
2. Step 2: Convert to fraction form
   72,072.72/108,021.33 = 51,018.72/x
3. Step 3: Cross multiply
   72,072.72x = 108,021.33 × 51,018.72
4. Step 4: Simplify right side
   72,072.72x = 5,511,109,989.30
5. Step 5: Solve for x
   x = 5,511,109,989.30/72,072.72
6. Step 6: Final answer
   x = 76,465.96