Finding the Fourth Proportional to 215,620.32, 323,530.92 and 82,456.72

Step by Step Solution

1. Step 1: Write the proportion equation
   215,620.32 : 323,530.92 = 82,456.72 : x
2. Step 2: Convert to fraction form
   215,620.32/323,530.92 = 82,456.72/x
3. Step 3: Cross multiply
   215,620.32x = 323,530.92 × 82,456.72
4. Step 4: Simplify right side
   215,620.32x = 26,677,298,481.78
5. Step 5: Solve for x
   x = 26,677,298,481.78/215,620.32
6. Step 6: Final answer
   x = 123,723.49