Finding the Fourth Proportional to 764,802.76, 1,055,453.59 and 420,665.31

Step by Step Solution

1. Step 1: Write the proportion equation
   764,802.76 : 1,055,453.59 = 420,665.31 : x
2. Step 2: Convert to fraction form
   764,802.76/1,055,453.59 = 420,665.31/x
3. Step 3: Cross multiply
   764,802.76x = 1,055,453.59 × 420,665.31
4. Step 4: Simplify right side
   764,802.76x = 443,992,707,963.29
5. Step 5: Solve for x
   x = 443,992,707,963.29/764,802.76
6. Step 6: Final answer
   x = 580,532.30