Finding the Fourth Proportional to 64,978.91, 89,676.11 and 51,660.08

Step by Step Solution

1. Step 1: Write the proportion equation
   64,978.91 : 89,676.11 = 51,660.08 : x
2. Step 2: Convert to fraction form
   64,978.91/89,676.11 = 51,660.08/x
3. Step 3: Cross multiply
   64,978.91x = 89,676.11 × 51,660.08
4. Step 4: Simplify right side
   64,978.91x = 4,632,675,016.69
5. Step 5: Solve for x
   x = 4,632,675,016.69/64,978.91
6. Step 6: Final answer
   x = 71,295.06