Finding the Fourth Proportional to 143,456.50, 197,969.97 and 83,840.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,456.50 : 197,969.97 = 83,840.50 : x
2. Step 2: Convert to fraction form
   143,456.50/197,969.97 = 83,840.50/x
3. Step 3: Cross multiply
   143,456.50x = 197,969.97 × 83,840.50
4. Step 4: Simplify right side
   143,456.50x = 16,597,901,269.79
5. Step 5: Solve for x
   x = 16,597,901,269.79/143,456.50
6. Step 6: Final answer
   x = 115,699.89