Finding the Fourth Proportional to 139,218.75, 208,559.34 and 83,103.71

Step by Step Solution

1. Step 1: Write the proportion equation
   139,218.75 : 208,559.34 = 83,103.71 : x
2. Step 2: Convert to fraction form
   139,218.75/208,559.34 = 83,103.71/x
3. Step 3: Cross multiply
   139,218.75x = 208,559.34 × 83,103.71
4. Step 4: Simplify right side
   139,218.75x = 17,332,053,866.35
5. Step 5: Solve for x
   x = 17,332,053,866.35/139,218.75
6. Step 6: Final answer
   x = 124,495.11