Finding the Fourth Proportional to 309,180.72, 426,572.55 and 173,196.30

Step by Step Solution

1. Step 1: Write the proportion equation
   309,180.72 : 426,572.55 = 173,196.30 : x
2. Step 2: Convert to fraction form
   309,180.72/426,572.55 = 173,196.30/x
3. Step 3: Cross multiply
   309,180.72x = 426,572.55 × 173,196.30
4. Step 4: Simplify right side
   309,180.72x = 73,880,787,341.57
5. Step 5: Solve for x
   x = 73,880,787,341.57/309,180.72
6. Step 6: Final answer
   x = 238,956.64