Finding the Third Proportional to 666.50 and 1,054.50

Step by Step Solution

1. Step 1: Write the proportion equation
   666.50 : 1,054.50 = 1,054.50 : x
2. Step 2: Convert to fraction form
   666.50/1,054.50 = 1,054.50/x
3. Step 3: Cross multiply
   666.50x = 1,054.50 × 1,054.50
4. Step 4: Simplify right side
   666.50x = 1,111,970.25
5. Step 5: Solve for x
   x = 1,111,970.25/666.50
6. Step 6: Final answer
   x = 1,668.37