Finding the Fourth Proportional to 217,978.32, 326,986.25 and 60,206.79

Step by Step Solution

1. Step 1: Write the proportion equation
   217,978.32 : 326,986.25 = 60,206.79 : x
2. Step 2: Convert to fraction form
   217,978.32/326,986.25 = 60,206.79/x
3. Step 3: Cross multiply
   217,978.32x = 326,986.25 × 60,206.79
4. Step 4: Simplify right side
   217,978.32x = 19,686,792,185.60
5. Step 5: Solve for x
   x = 19,686,792,185.60/217,978.32
6. Step 6: Final answer
   x = 90,315.37