Finding the Fourth Proportional to 259,697.72, 389,560.76 and 82,191.49

Step by Step Solution

1. Step 1: Write the proportion equation
   259,697.72 : 389,560.76 = 82,191.49 : x
2. Step 2: Convert to fraction form
   259,697.72/389,560.76 = 82,191.49/x
3. Step 3: Cross multiply
   259,697.72x = 389,560.76 × 82,191.49
4. Step 4: Simplify right side
   259,697.72x = 32,018,579,309.93
5. Step 5: Solve for x
   x = 32,018,579,309.93/259,697.72
6. Step 6: Final answer
   x = 123,291.72