Finding the Fourth Proportional to 309,123.68, 426,596.10 and 173,156.56

Step by Step Solution

1. Step 1: Write the proportion equation
   309,123.68 : 426,596.10 = 173,156.56 : x
2. Step 2: Convert to fraction form
   309,123.68/426,596.10 = 173,156.56/x
3. Step 3: Cross multiply
   309,123.68x = 426,596.10 × 173,156.56
4. Step 4: Simplify right side
   309,123.68x = 73,867,913,185.42
5. Step 5: Solve for x
   x = 73,867,913,185.42/309,123.68
6. Step 6: Final answer
   x = 238,959.09