Finding the Fourth Proportional to 215,751.72, 323,630.28 and 82,639.98

Step by Step Solution

1. Step 1: Write the proportion equation
   215,751.72 : 323,630.28 = 82,639.98 : x
2. Step 2: Convert to fraction form
   215,751.72/323,630.28 = 82,639.98/x
3. Step 3: Cross multiply
   215,751.72x = 323,630.28 × 82,639.98
4. Step 4: Simplify right side
   215,751.72x = 26,744,799,866.59
5. Step 5: Solve for x
   x = 26,744,799,866.59/215,751.72
6. Step 6: Final answer
   x = 123,961.00