Finding the Fourth Proportional to 777,678.72, 1,073,196.72 and 419,982.72

Step by Step Solution

1. Step 1: Write the proportion equation
   777,678.72 : 1,073,196.72 = 419,982.72 : x
2. Step 2: Convert to fraction form
   777,678.72/1,073,196.72 = 419,982.72/x
3. Step 3: Cross multiply
   777,678.72x = 1,073,196.72 × 419,982.72
4. Step 4: Simplify right side
   777,678.72x = 450,724,077,560.68
5. Step 5: Solve for x
   x = 450,724,077,560.68/777,678.72
6. Step 6: Final answer
   x = 579,576.20