Finding the Fourth Proportional to 764,566.38, 1,055,128.86 and 420,428.52

Step by Step Solution

1. Step 1: Write the proportion equation
   764,566.38 : 1,055,128.86 = 420,428.52 : x
2. Step 2: Convert to fraction form
   764,566.38/1,055,128.86 = 420,428.52/x
3. Step 3: Cross multiply
   764,566.38x = 1,055,128.86 × 420,428.52
4. Step 4: Simplify right side
   764,566.38x = 443,606,265,019.09
5. Step 5: Solve for x
   x = 443,606,265,019.09/764,566.38
6. Step 6: Final answer
   x = 580,206.35