Finding the Fourth Proportional to 309,402.77, 426,995.55 and 173,436.77

Step by Step Solution

1. Step 1: Write the proportion equation
   309,402.77 : 426,995.55 = 173,436.77 : x
2. Step 2: Convert to fraction form
   309,402.77/426,995.55 = 173,436.77/x
3. Step 3: Cross multiply
   309,402.77x = 426,995.55 × 173,436.77
4. Step 4: Simplify right side
   309,402.77x = 74,056,730,063.86
5. Step 5: Solve for x
   x = 74,056,730,063.86/309,402.77
6. Step 6: Final answer
   x = 239,353.81