Finding the Fourth Proportional to 65,286.21, 89,508.21 and 64,105.23

Step by Step Solution

1. Step 1: Write the proportion equation
   65,286.21 : 89,508.21 = 64,105.23 : x
2. Step 2: Convert to fraction form
   65,286.21/89,508.21 = 64,105.23/x
3. Step 3: Cross multiply
   65,286.21x = 89,508.21 × 64,105.23
4. Step 4: Simplify right side
   65,286.21x = 5,737,944,388.94
5. Step 5: Solve for x
   x = 5,737,944,388.94/65,286.21
6. Step 6: Final answer
   x = 87,889.07