Finding the Fourth Proportional to 65,238.75, 89,354.88 and 61,408.80

Step by Step Solution

1. Step 1: Write the proportion equation
   65,238.75 : 89,354.88 = 61,408.80 : x
2. Step 2: Convert to fraction form
   65,238.75/89,354.88 = 61,408.80/x
3. Step 3: Cross multiply
   65,238.75x = 89,354.88 × 61,408.80
4. Step 4: Simplify right side
   65,238.75x = 5,487,175,954.94
5. Step 5: Solve for x
   x = 5,487,175,954.94/65,238.75
6. Step 6: Final answer
   x = 84,109.15