Finding the Fourth Proportional to 764,581.59, 1,055,145.56 and 420,399.72

Step by Step Solution

1. Step 1: Write the proportion equation
   764,581.59 : 1,055,145.56 = 420,399.72 : x
2. Step 2: Convert to fraction form
   764,581.59/1,055,145.56 = 420,399.72/x
3. Step 3: Cross multiply
   764,581.59x = 1,055,145.56 × 420,399.72
4. Step 4: Simplify right side
   764,581.59x = 443,582,895,881.25
5. Step 5: Solve for x
   x = 443,582,895,881.25/764,581.59
6. Step 6: Final answer
   x = 580,164.24