Finding the Fourth Proportional to 139,783.82, 209,674.74 and 83,639.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,783.82 : 209,674.74 = 83,639.57 : x
2. Step 2: Convert to fraction form
   139,783.82/209,674.74 = 83,639.57/x
3. Step 3: Cross multiply
   139,783.82x = 209,674.74 × 83,639.57
4. Step 4: Simplify right side
   139,783.82x = 17,537,105,093.46
5. Step 5: Solve for x
   x = 17,537,105,093.46/139,783.82
6. Step 6: Final answer
   x = 125,458.76