Finding the Fourth Proportional to 221,091.50, 331,639.42 and 54,879.50

Step by Step Solution

1. Step 1: Write the proportion equation
   221,091.50 : 331,639.42 = 54,879.50 : x
2. Step 2: Convert to fraction form
   221,091.50/331,639.42 = 54,879.50/x
3. Step 3: Cross multiply
   221,091.50x = 331,639.42 × 54,879.50
4. Step 4: Simplify right side
   221,091.50x = 18,200,205,549.89
5. Step 5: Solve for x
   x = 18,200,205,549.89/221,091.50
6. Step 6: Final answer
   x = 82,319.79