Finding the Fourth Proportional to 404,429.20, 607,810.20 and 353,107.60

Step by Step Solution

1. Step 1: Write the proportion equation
   404,429.20 : 607,810.20 = 353,107.60 : x
2. Step 2: Convert to fraction form
   404,429.20/607,810.20 = 353,107.60/x
3. Step 3: Cross multiply
   404,429.20x = 607,810.20 × 353,107.60
4. Step 4: Simplify right side
   404,429.20x = 214,622,400,977.52
5. Step 5: Solve for x
   x = 214,622,400,977.52/404,429.20
6. Step 6: Final answer
   x = 530,679.79