Finding the Fourth Proportional to 501,155.45, 690,925.49 and 398,131.48

Step by Step Solution

1. Step 1: Write the proportion equation
   501,155.45 : 690,925.49 = 398,131.48 : x
2. Step 2: Convert to fraction form
   501,155.45/690,925.49 = 398,131.48/x
3. Step 3: Cross multiply
   501,155.45x = 690,925.49 × 398,131.48
4. Step 4: Simplify right side
   501,155.45x = 275,079,189,800.90
5. Step 5: Solve for x
   x = 275,079,189,800.90/501,155.45
6. Step 6: Final answer
   x = 548,889.95