Finding the Fourth Proportional to 259,321.89, 388,982.91 and 81,842.79

Step by Step Solution

1. Step 1: Write the proportion equation
   259,321.89 : 388,982.91 = 81,842.79 : x
2. Step 2: Convert to fraction form
   259,321.89/388,982.91 = 81,842.79/x
3. Step 3: Cross multiply
   259,321.89x = 388,982.91 × 81,842.79
4. Step 4: Simplify right side
   259,321.89x = 31,835,446,616.72
5. Step 5: Solve for x
   x = 31,835,446,616.72/259,321.89
6. Step 6: Final answer
   x = 122,764.21