Finding the Fourth Proportional to 309,061.56, 426,456.24 and 180,021.28

Step by Step Solution

1. Step 1: Write the proportion equation
   309,061.56 : 426,456.24 = 180,021.28 : x
2. Step 2: Convert to fraction form
   309,061.56/426,456.24 = 180,021.28/x
3. Step 3: Cross multiply
   309,061.56x = 426,456.24 × 180,021.28
4. Step 4: Simplify right side
   309,061.56x = 76,771,198,188.79
5. Step 5: Solve for x
   x = 76,771,198,188.79/309,061.56
6. Step 6: Final answer
   x = 248,400.99