Finding the Fourth Proportional to 82,620.28, 123,930.54 and 20,290.84

Step by Step Solution

1. Step 1: Write the proportion equation
   82,620.28 : 123,930.54 = 20,290.84 : x
2. Step 2: Convert to fraction form
   82,620.28/123,930.54 = 20,290.84/x
3. Step 3: Cross multiply
   82,620.28x = 123,930.54 × 20,290.84
4. Step 4: Simplify right side
   82,620.28x = 2,514,654,758.25
5. Step 5: Solve for x
   x = 2,514,654,758.25/82,620.28
6. Step 6: Final answer
   x = 30,436.29