Finding the Fourth Proportional to 142,580.49, 196,739.04 and 82,139.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142,580.49 : 196,739.04 = 82,139.31 : x
2. Step 2: Convert to fraction form
   142,580.49/196,739.04 = 82,139.31/x
3. Step 3: Cross multiply
   142,580.49x = 196,739.04 × 82,139.31
4. Step 4: Simplify right side
   142,580.49x = 16,160,008,995.66
5. Step 5: Solve for x
   x = 16,160,008,995.66/142,580.49
6. Step 6: Final answer
   x = 113,339.55