Finding the Fourth Proportional to 720,789.82, 994,710.71 and 398,520.72

Step by Step Solution

1. Step 1: Write the proportion equation
   720,789.82 : 994,710.71 = 398,520.72 : x
2. Step 2: Convert to fraction form
   720,789.82/994,710.71 = 398,520.72/x
3. Step 3: Cross multiply
   720,789.82x = 994,710.71 × 398,520.72
4. Step 4: Simplify right side
   720,789.82x = 396,412,829,337.21
5. Step 5: Solve for x
   x = 396,412,829,337.21/720,789.82
6. Step 6: Final answer
   x = 549,970.07