Finding the Fourth Proportional to 1,429.97, 2,145.03 and 456.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.97 : 2,145.03 = 456.15 : x
2. Step 2: Convert to fraction form
   1,429.97/2,145.03 = 456.15/x
3. Step 3: Cross multiply
   1,429.97x = 2,145.03 × 456.15
4. Step 4: Simplify right side
   1,429.97x = 978,455.43
5. Step 5: Solve for x
   x = 978,455.43/1,429.97
6. Step 6: Final answer
   x = 684.25