Finding the Fourth Proportional to 764,569.09, 1,055,128.31 and 420,387.22

Step by Step Solution

1. Step 1: Write the proportion equation
   764,569.09 : 1,055,128.31 = 420,387.22 : x
2. Step 2: Convert to fraction form
   764,569.09/1,055,128.31 = 420,387.22/x
3. Step 3: Cross multiply
   764,569.09x = 1,055,128.31 × 420,387.22
4. Step 4: Simplify right side
   764,569.09x = 443,562,456,984.20
5. Step 5: Solve for x
   x = 443,562,456,984.20/764,569.09
6. Step 6: Final answer
   x = 580,146.99