Finding the Fourth Proportional to 856,059.10, 1,284,105.06 and 279,683.98

Step by Step Solution

1. Step 1: Write the proportion equation
   856,059.10 : 1,284,105.06 = 279,683.98 : x
2. Step 2: Convert to fraction form
   856,059.10/1,284,105.06 = 279,683.98/x
3. Step 3: Cross multiply
   856,059.10x = 1,284,105.06 × 279,683.98
4. Step 4: Simplify right side
   856,059.10x = 359,143,613,918.94
5. Step 5: Solve for x
   x = 359,143,613,918.94/856,059.10
6. Step 6: Final answer
   x = 419,531.33