Finding the Fourth Proportional to 728,699.31, 1,005,606.83 and 406,430.28

Step by Step Solution

1. Step 1: Write the proportion equation
   728,699.31 : 1,005,606.83 = 406,430.28 : x
2. Step 2: Convert to fraction form
   728,699.31/1,005,606.83 = 406,430.28/x
3. Step 3: Cross multiply
   728,699.31x = 1,005,606.83 × 406,430.28
4. Step 4: Simplify right side
   728,699.31x = 408,709,066,502.89
5. Step 5: Solve for x
   x = 408,709,066,502.89/728,699.31
6. Step 6: Final answer
   x = 560,874.78