Finding the Fourth Proportional to 82,138.86, 123,208.41 and 19,809.36

Step by Step Solution

1. Step 1: Write the proportion equation
   82,138.86 : 123,208.41 = 19,809.36 : x
2. Step 2: Convert to fraction form
   82,138.86/123,208.41 = 19,809.36/x
3. Step 3: Cross multiply
   82,138.86x = 123,208.41 × 19,809.36
4. Step 4: Simplify right side
   82,138.86x = 2,440,679,748.72
5. Step 5: Solve for x
   x = 2,440,679,748.72/82,138.86
6. Step 6: Final answer
   x = 29,714.07