Finding the Fourth Proportional to 139,033.49, 208,522.56 and 82,128.83

Step by Step Solution

1. Step 1: Write the proportion equation
   139,033.49 : 208,522.56 = 82,128.83 : x
2. Step 2: Convert to fraction form
   139,033.49/208,522.56 = 82,128.83/x
3. Step 3: Cross multiply
   139,033.49x = 208,522.56 × 82,128.83
4. Step 4: Simplify right side
   139,033.49x = 17,125,713,881.40
5. Step 5: Solve for x
   x = 17,125,713,881.40/139,033.49
6. Step 6: Final answer
   x = 123,176.90