Finding the Fourth Proportional to 65,317.16, 89,936.53 and 57,204.05

Step by Step Solution

1. Step 1: Write the proportion equation
   65,317.16 : 89,936.53 = 57,204.05 : x
2. Step 2: Convert to fraction form
   65,317.16/89,936.53 = 57,204.05/x
3. Step 3: Cross multiply
   65,317.16x = 89,936.53 × 57,204.05
4. Step 4: Simplify right side
   65,317.16x = 5,144,733,166.25
5. Step 5: Solve for x
   x = 5,144,733,166.25/65,317.16
6. Step 6: Final answer
   x = 78,765.41