Finding the Fourth Proportional to 65,396.37, 89,657.32 and 64,215.39

Step by Step Solution

1. Step 1: Write the proportion equation
   65,396.37 : 89,657.32 = 64,215.39 : x
2. Step 2: Convert to fraction form
   65,396.37/89,657.32 = 64,215.39/x
3. Step 3: Cross multiply
   65,396.37x = 89,657.32 × 64,215.39
4. Step 4: Simplify right side
   65,396.37x = 5,757,379,770.15
5. Step 5: Solve for x
   x = 5,757,379,770.15/65,396.37
6. Step 6: Final answer
   x = 88,038.22