Finding the Fourth Proportional to 139,023.87, 208,503.81 and 82,879.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,023.87 : 208,503.81 = 82,879.80 : x
2. Step 2: Convert to fraction form
   139,023.87/208,503.81 = 82,879.80/x
3. Step 3: Cross multiply
   139,023.87x = 208,503.81 × 82,879.80
4. Step 4: Simplify right side
   139,023.87x = 17,280,754,072.04
5. Step 5: Solve for x
   x = 17,280,754,072.04/139,023.87
6. Step 6: Final answer
   x = 124,300.63