Finding the Fourth Proportional to 772,410.72, 1,065,989.61 and 428,280.80

Step by Step Solution

1. Step 1: Write the proportion equation
   772,410.72 : 1,065,989.61 = 428,280.80 : x
2. Step 2: Convert to fraction form
   772,410.72/1,065,989.61 = 428,280.80/x
3. Step 3: Cross multiply
   772,410.72x = 1,065,989.61 × 428,280.80
4. Step 4: Simplify right side
   772,410.72x = 456,542,877,632.54
5. Step 5: Solve for x
   x = 456,542,877,632.54/772,410.72
6. Step 6: Final answer
   x = 591,062.33