Finding the Third Proportional to 641.67 and 1,054.69

Step by Step Solution

1. Step 1: Write the proportion equation
   641.67 : 1,054.69 = 1,054.69 : x
2. Step 2: Convert to fraction form
   641.67/1,054.69 = 1,054.69/x
3. Step 3: Cross multiply
   641.67x = 1,054.69 × 1,054.69
4. Step 4: Simplify right side
   641.67x = 1,112,365.72
5. Step 5: Solve for x
   x = 1,112,365.72/641.67
6. Step 6: Final answer
   x = 1,733.54