Finding the Fourth Proportional to 720,395.37, 994,061.03 and 398,086.25

Step by Step Solution

1. Step 1: Write the proportion equation
   720,395.37 : 994,061.03 = 398,086.25 : x
2. Step 2: Convert to fraction form
   720,395.37/994,061.03 = 398,086.25/x
3. Step 3: Cross multiply
   720,395.37x = 994,061.03 × 398,086.25
4. Step 4: Simplify right side
   720,395.37x = 395,722,020,743.10
5. Step 5: Solve for x
   x = 395,722,020,743.10/720,395.37
6. Step 6: Final answer
   x = 549,312.28