Finding the Fourth Proportional to 65,325.78, 89,562.67 and 64,144.80

Step by Step Solution

1. Step 1: Write the proportion equation
   65,325.78 : 89,562.67 = 64,144.80 : x
2. Step 2: Convert to fraction form
   65,325.78/89,562.67 = 64,144.80/x
3. Step 3: Cross multiply
   65,325.78x = 89,562.67 × 64,144.80
4. Step 4: Simplify right side
   65,325.78x = 5,744,979,554.62
5. Step 5: Solve for x
   x = 5,744,979,554.62/65,325.78
6. Step 6: Final answer
   x = 87,943.53