Finding the Fourth Proportional to 1,240.42, 1,860.89 and 419.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,240.42 : 1,860.89 = 419.27 : x
2. Step 2: Convert to fraction form
   1,240.42/1,860.89 = 419.27/x
3. Step 3: Cross multiply
   1,240.42x = 1,860.89 × 419.27
4. Step 4: Simplify right side
   1,240.42x = 780,217.91
5. Step 5: Solve for x
   x = 780,217.91/1,240.42
6. Step 6: Final answer
   x = 629.00