Finding the Fourth Proportional to 216,112.43, 324,098.55 and 71,979.89

Step by Step Solution

1. Step 1: Write the proportion equation
   216,112.43 : 324,098.55 = 71,979.89 : x
2. Step 2: Convert to fraction form
   216,112.43/324,098.55 = 71,979.89/x
3. Step 3: Cross multiply
   216,112.43x = 324,098.55 × 71,979.89
4. Step 4: Simplify right side
   216,112.43x = 23,328,577,978.16
5. Step 5: Solve for x
   x = 23,328,577,978.16/216,112.43
6. Step 6: Final answer
   x = 107,946.49