Finding the Third Proportional to 421.69 and 910.50

Step by Step Solution

1. Step 1: Write the proportion equation
   421.69 : 910.50 = 910.50 : x
2. Step 2: Convert to fraction form
   421.69/910.50 = 910.50/x
3. Step 3: Cross multiply
   421.69x = 910.50 × 910.50
4. Step 4: Simplify right side
   421.69x = 829,010.25
5. Step 5: Solve for x
   x = 829,010.25/421.69
6. Step 6: Final answer
   x = 1,965.94