Finding the Fourth Proportional to 1,064.43, 1,469.12 and 666.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.43 : 1,469.12 = 666.15 : x
2. Step 2: Convert to fraction form
   1,064.43/1,469.12 = 666.15/x
3. Step 3: Cross multiply
   1,064.43x = 1,469.12 × 666.15
4. Step 4: Simplify right side
   1,064.43x = 978,650.96
5. Step 5: Solve for x
   x = 978,650.96/1,064.43
6. Step 6: Final answer
   x = 919.41