Finding the Fourth Proportional to 259,419.01, 386,549.72 and 231,121.66

Step by Step Solution

1. Step 1: Write the proportion equation
   259,419.01 : 386,549.72 = 231,121.66 : x
2. Step 2: Convert to fraction form
   259,419.01/386,549.72 = 231,121.66/x
3. Step 3: Cross multiply
   259,419.01x = 386,549.72 × 231,121.66
4. Step 4: Simplify right side
   259,419.01x = 89,340,012,958.94
5. Step 5: Solve for x
   x = 89,340,012,958.94/259,419.01
6. Step 6: Final answer
   x = 344,384.99