Finding the Fourth Proportional to 65,286.71, 89,508.90 and 64,105.73

Step by Step Solution

1. Step 1: Write the proportion equation
   65,286.71 : 89,508.90 = 64,105.73 : x
2. Step 2: Convert to fraction form
   65,286.71/89,508.90 = 64,105.73/x
3. Step 3: Cross multiply
   65,286.71x = 89,508.90 × 64,105.73
4. Step 4: Simplify right side
   65,286.71x = 5,738,033,055.47
5. Step 5: Solve for x
   x = 5,738,033,055.47/65,286.71
6. Step 6: Final answer
   x = 87,889.76