Finding the Fourth Proportional to 215,751.69, 323,630.55 and 82,638.72

Step by Step Solution

1. Step 1: Write the proportion equation
   215,751.69 : 323,630.55 = 82,638.72 : x
2. Step 2: Convert to fraction form
   215,751.69/323,630.55 = 82,638.72/x
3. Step 3: Cross multiply
   215,751.69x = 323,630.55 × 82,638.72
4. Step 4: Simplify right side
   215,751.69x = 26,744,414,404.90
5. Step 5: Solve for x
   x = 26,744,414,404.90/215,751.69
6. Step 6: Final answer
   x = 123,959.23