Finding the Fourth Proportional to 82,709.26, 123,128.53 and 82,217.18

Step by Step Solution

1. Step 1: Write the proportion equation
   82,709.26 : 123,128.53 = 82,217.18 : x
2. Step 2: Convert to fraction form
   82,709.26/123,128.53 = 82,217.18/x
3. Step 3: Cross multiply
   82,709.26x = 123,128.53 × 82,217.18
4. Step 4: Simplify right side
   82,709.26x = 10,123,280,514.15
5. Step 5: Solve for x
   x = 10,123,280,514.15/82,709.26
6. Step 6: Final answer
   x = 122,395.97