Finding the Fourth Proportional to 309,404.77, 426,998.31 and 173,438.77

Step by Step Solution

1. Step 1: Write the proportion equation
   309,404.77 : 426,998.31 = 173,438.77 : x
2. Step 2: Convert to fraction form
   309,404.77/426,998.31 = 173,438.77/x
3. Step 3: Cross multiply
   309,404.77x = 426,998.31 × 173,438.77
4. Step 4: Simplify right side
   309,404.77x = 74,058,061,678.48
5. Step 5: Solve for x
   x = 74,058,061,678.48/309,404.77
6. Step 6: Final answer
   x = 239,356.56