Finding the Fourth Proportional to 139,036.49, 208,527.06 and 82,131.83

Step by Step Solution

1. Step 1: Write the proportion equation
   139,036.49 : 208,527.06 = 82,131.83 : x
2. Step 2: Convert to fraction form
   139,036.49/208,527.06 = 82,131.83/x
3. Step 3: Cross multiply
   139,036.49x = 208,527.06 × 82,131.83
4. Step 4: Simplify right side
   139,036.49x = 17,126,709,042.32
5. Step 5: Solve for x
   x = 17,126,709,042.32/139,036.49
6. Step 6: Final answer
   x = 123,181.40