Finding the Fourth Proportional to 139,601.17, 208,873.34 and 82,705.62

Step by Step Solution

1. Step 1: Write the proportion equation
   139,601.17 : 208,873.34 = 82,705.62 : x
2. Step 2: Convert to fraction form
   139,601.17/208,873.34 = 82,705.62/x
3. Step 3: Cross multiply
   139,601.17x = 208,873.34 × 82,705.62
4. Step 4: Simplify right side
   139,601.17x = 17,274,998,672.64
5. Step 5: Solve for x
   x = 17,274,998,672.64/139,601.17
6. Step 6: Final answer
   x = 123,745.38