Finding the Fourth Proportional to 1,430.05, 2,145.17 and 456.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.05 : 2,145.17 = 456.22 : x
2. Step 2: Convert to fraction form
   1,430.05/2,145.17 = 456.22/x
3. Step 3: Cross multiply
   1,430.05x = 2,145.17 × 456.22
4. Step 4: Simplify right side
   1,430.05x = 978,667.18
5. Step 5: Solve for x
   x = 978,667.18/1,430.05
6. Step 6: Final answer
   x = 684.36