Finding the Fourth Proportional to 728,722.81, 1,005,638.83 and 406,453.69

Step by Step Solution

1. Step 1: Write the proportion equation
   728,722.81 : 1,005,638.83 = 406,453.69 : x
2. Step 2: Convert to fraction form
   728,722.81/1,005,638.83 = 406,453.69/x
3. Step 3: Cross multiply
   728,722.81x = 1,005,638.83 × 406,453.69
4. Step 4: Simplify right side
   728,722.81x = 408,745,609,730.55
5. Step 5: Solve for x
   x = 408,745,609,730.55/728,722.81
6. Step 6: Final answer
   x = 560,906.84