Finding the Fourth Proportional to 728,118.88, 1,004,808.71 and 405,849.40

Step by Step Solution

1. Step 1: Write the proportion equation
   728,118.88 : 1,004,808.71 = 405,849.40 : x
2. Step 2: Convert to fraction form
   728,118.88/1,004,808.71 = 405,849.40/x
3. Step 3: Cross multiply
   728,118.88x = 1,004,808.71 × 405,849.40
4. Step 4: Simplify right side
   728,118.88x = 407,801,012,068.27
5. Step 5: Solve for x
   x = 407,801,012,068.27/728,118.88
6. Step 6: Final answer
   x = 560,074.77