Finding the Fourth Proportional to 85,139.39, 127,512.25 and 82,186.94

Step by Step Solution

1. Step 1: Write the proportion equation
   85,139.39 : 127,512.25 = 82,186.94 : x
2. Step 2: Convert to fraction form
   85,139.39/127,512.25 = 82,186.94/x
3. Step 3: Cross multiply
   85,139.39x = 127,512.25 × 82,186.94
4. Step 4: Simplify right side
   85,139.39x = 10,479,840,591.52
5. Step 5: Solve for x
   x = 10,479,840,591.52/85,139.39
6. Step 6: Final answer
   x = 123,090.40