Finding the Fourth Proportional to 85,730.82, 128,793.86 and 82,187.94

Step by Step Solution

1. Step 1: Write the proportion equation
   85,730.82 : 128,793.86 = 82,187.94 : x
2. Step 2: Convert to fraction form
   85,730.82/128,793.86 = 82,187.94/x
3. Step 3: Cross multiply
   85,730.82x = 128,793.86 × 82,187.94
4. Step 4: Simplify right side
   85,730.82x = 10,585,302,038.05
5. Step 5: Solve for x
   x = 10,585,302,038.05/85,730.82
6. Step 6: Final answer
   x = 123,471.37