Finding the Fourth Proportional to 139,021.84, 208,500.78 and 82,877.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,021.84 : 208,500.78 = 82,877.80 : x
2. Step 2: Convert to fraction form
   139,021.84/208,500.78 = 82,877.80/x
3. Step 3: Cross multiply
   139,021.84x = 208,500.78 × 82,877.80
4. Step 4: Simplify right side
   139,021.84x = 17,280,085,944.68
5. Step 5: Solve for x
   x = 17,280,085,944.68/139,021.84
6. Step 6: Final answer
   x = 124,297.64