Finding the Fourth Proportional to 65,389.56, 89,648.00 and 64,208.58

Step by Step Solution

1. Step 1: Write the proportion equation
   65,389.56 : 89,648.00 = 64,208.58 : x
2. Step 2: Convert to fraction form
   65,389.56/89,648.00 = 64,208.58/x
3. Step 3: Cross multiply
   65,389.56x = 89,648.00 × 64,208.58
4. Step 4: Simplify right side
   65,389.56x = 5,756,170,458.80
5. Step 5: Solve for x
   x = 5,756,170,458.80/65,389.56
6. Step 6: Final answer
   x = 88,028.89