Finding the Fourth Proportional to 81,679.57, 122,404.42 and 64,965.42

Step by Step Solution

1. Step 1: Write the proportion equation
   81,679.57 : 122,404.42 = 64,965.42 : x
2. Step 2: Convert to fraction form
   81,679.57/122,404.42 = 64,965.42/x
3. Step 3: Cross multiply
   81,679.57x = 122,404.42 × 64,965.42
4. Step 4: Simplify right side
   81,679.57x = 7,952,054,555.16
5. Step 5: Solve for x
   x = 7,952,054,555.16/81,679.57
6. Step 6: Final answer
   x = 97,356.71