Finding the Fourth Proportional to 1,064.31, 1,468.90 and 666.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.31 : 1,468.90 = 666.37 : x
2. Step 2: Convert to fraction form
   1,064.31/1,468.90 = 666.37/x
3. Step 3: Cross multiply
   1,064.31x = 1,468.90 × 666.37
4. Step 4: Simplify right side
   1,064.31x = 978,821.55
5. Step 5: Solve for x
   x = 978,821.55/1,064.31
6. Step 6: Final answer
   x = 919.68