Finding the Fourth Proportional to 85,456.65, 128,212.67 and 41,086.88

Step by Step Solution

1. Step 1: Write the proportion equation
   85,456.65 : 128,212.67 = 41,086.88 : x
2. Step 2: Convert to fraction form
   85,456.65/128,212.67 = 41,086.88/x
3. Step 3: Cross multiply
   85,456.65x = 128,212.67 × 41,086.88
4. Step 4: Simplify right side
   85,456.65x = 5,267,858,529.22
5. Step 5: Solve for x
   x = 5,267,858,529.22/85,456.65
6. Step 6: Final answer
   x = 61,643.63