Finding the Fourth Proportional to 766,339.74, 1,147,453.89 and 428,418

Step by Step Solution

1. Step 1: Write the proportion equation
   766,339.74 : 1,147,453.89 = 428,418 : x
2. Step 2: Convert to fraction form
   766,339.74/1,147,453.89 = 428,418/x
3. Step 3: Cross multiply
   766,339.74x = 1,147,453.89 × 428,418
4. Step 4: Simplify right side
   766,339.74x = 491,589,900,646.02
5. Step 5: Solve for x
   x = 491,589,900,646.02/766,339.74
6. Step 6: Final answer
   x = 641,477.76