Finding the Third Proportional to 646,663.50 and 978,939

Step by Step Solution

1. Step 1: Write the proportion equation
   646,663.50 : 978,939 = 978,939 : x
2. Step 2: Convert to fraction form
   646,663.50/978,939 = 978,939/x
3. Step 3: Cross multiply
   646,663.50x = 978,939 × 978,939
4. Step 4: Simplify right side
   646,663.50x = 958,321,565,721
5. Step 5: Solve for x
   x = 958,321,565,721/646,663.50
6. Step 6: Final answer
   x = 1,481,947.82