Finding the Fourth Proportional to 139,336.59, 209,003.77 and 82,802.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,336.59 : 209,003.77 = 82,802.30 : x
2. Step 2: Convert to fraction form
   139,336.59/209,003.77 = 82,802.30/x
3. Step 3: Cross multiply
   139,336.59x = 209,003.77 × 82,802.30
4. Step 4: Simplify right side
   139,336.59x = 17,305,992,864.67
5. Step 5: Solve for x
   x = 17,305,992,864.67/139,336.59
6. Step 6: Final answer
   x = 124,202.79