Finding the Fourth Proportional to 298,426.56, 447,240.56 and 146,391.20

Step by Step Solution

1. Step 1: Write the proportion equation
   298,426.56 : 447,240.56 = 146,391.20 : x
2. Step 2: Convert to fraction form
   298,426.56/447,240.56 = 146,391.20/x
3. Step 3: Cross multiply
   298,426.56x = 447,240.56 × 146,391.20
4. Step 4: Simplify right side
   298,426.56x = 65,472,082,267.07
5. Step 5: Solve for x
   x = 65,472,082,267.07/298,426.56
6. Step 6: Final answer
   x = 219,390.94