Finding the Fourth Proportional to 764,802.86, 1,055,453.72 and 420,653.28

Step by Step Solution

1. Step 1: Write the proportion equation
   764,802.86 : 1,055,453.72 = 420,653.28 : x
2. Step 2: Convert to fraction form
   764,802.86/1,055,453.72 = 420,653.28/x
3. Step 3: Cross multiply
   764,802.86x = 1,055,453.72 × 420,653.28
4. Step 4: Simplify right side
   764,802.86x = 443,980,063,338.58
5. Step 5: Solve for x
   x = 443,980,063,338.58/764,802.86
6. Step 6: Final answer
   x = 580,515.69