Finding the Fourth Proportional to 103,418.56, 155,139.18 and 82,358.56

Step by Step Solution

1. Step 1: Write the proportion equation
   103,418.56 : 155,139.18 = 82,358.56 : x
2. Step 2: Convert to fraction form
   103,418.56/155,139.18 = 82,358.56/x
3. Step 3: Cross multiply
   103,418.56x = 155,139.18 × 82,358.56
4. Step 4: Simplify right side
   103,418.56x = 12,777,039,464.38
5. Step 5: Solve for x
   x = 12,777,039,464.38/103,418.56
6. Step 6: Final answer
   x = 123,546.87