Finding the Fourth Proportional to 215,826.72, 323,743.20 and 82,713.72

Step by Step Solution

1. Step 1: Write the proportion equation
   215,826.72 : 323,743.20 = 82,713.72 : x
2. Step 2: Convert to fraction form
   215,826.72/323,743.20 = 82,713.72/x
3. Step 3: Cross multiply
   215,826.72x = 323,743.20 × 82,713.72
4. Step 4: Simplify right side
   215,826.72x = 26,778,004,396.70
5. Step 5: Solve for x
   x = 26,778,004,396.70/215,826.72
6. Step 6: Final answer
   x = 124,071.78