Finding the Fourth Proportional to 259,080.72, 388,635.01 and 81,601.62

Step by Step Solution

1. Step 1: Write the proportion equation
   259,080.72 : 388,635.01 = 81,601.62 : x
2. Step 2: Convert to fraction form
   259,080.72/388,635.01 = 81,601.62/x
3. Step 3: Cross multiply
   259,080.72x = 388,635.01 × 81,601.62
4. Step 4: Simplify right side
   259,080.72x = 31,713,246,404.72
5. Step 5: Solve for x
   x = 31,713,246,404.72/259,080.72
6. Step 6: Final answer
   x = 122,406.82