Finding the Fourth Proportional to 85,665.88, 118,255.98 and 64,450.36

Step by Step Solution

1. Step 1: Write the proportion equation
   85,665.88 : 118,255.98 = 64,450.36 : x
2. Step 2: Convert to fraction form
   85,665.88/118,255.98 = 64,450.36/x
3. Step 3: Cross multiply
   85,665.88x = 118,255.98 × 64,450.36
4. Step 4: Simplify right side
   85,665.88x = 7,621,640,483.15
5. Step 5: Solve for x
   x = 7,621,640,483.15/85,665.88
6. Step 6: Final answer
   x = 88,969.38