Finding the Fourth Proportional to 82,139.11, 123,208.79 and 19,809.61

Step by Step Solution

1. Step 1: Write the proportion equation
   82,139.11 : 123,208.79 = 19,809.61 : x
2. Step 2: Convert to fraction form
   82,139.11/123,208.79 = 19,809.61/x
3. Step 3: Cross multiply
   82,139.11x = 123,208.79 × 19,809.61
4. Step 4: Simplify right side
   82,139.11x = 2,440,718,078.47
5. Step 5: Solve for x
   x = 2,440,718,078.47/82,139.11
6. Step 6: Final answer
   x = 29,714.45