Finding the Fourth Proportional to 2,150.74, 3,228.12 and 1,420.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,150.74 : 3,228.12 = 1,420.78 : x
2. Step 2: Convert to fraction form
   2,150.74/3,228.12 = 1,420.78/x
3. Step 3: Cross multiply
   2,150.74x = 3,228.12 × 1,420.78
4. Step 4: Simplify right side
   2,150.74x = 4,586,448.33
5. Step 5: Solve for x
   x = 4,586,448.33/2,150.74
6. Step 6: Final answer
   x = 2,132.50