Finding the Fourth Proportional to 259,834.20, 389,763.45 and 82,355.10

Step by Step Solution

1. Step 1: Write the proportion equation
   259,834.20 : 389,763.45 = 82,355.10 : x
2. Step 2: Convert to fraction form
   259,834.20/389,763.45 = 82,355.10/x
3. Step 3: Cross multiply
   259,834.20x = 389,763.45 × 82,355.10
4. Step 4: Simplify right side
   259,834.20x = 32,099,007,901.10
5. Step 5: Solve for x
   x = 32,099,007,901.10/259,834.20
6. Step 6: Final answer
   x = 123,536.50