Finding the Fourth Proportional to 139,023.12, 208,502.69 and 82,879.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139,023.12 : 208,502.69 = 82,879.05 : x
2. Step 2: Convert to fraction form
   139,023.12/208,502.69 = 82,879.05/x
3. Step 3: Cross multiply
   139,023.12x = 208,502.69 × 82,879.05
4. Step 4: Simplify right side
   139,023.12x = 17,280,504,455.25
5. Step 5: Solve for x
   x = 17,280,504,455.25/139,023.12
6. Step 6: Final answer
   x = 124,299.50