Finding the Third Proportional to 661,279.50 and 989,361

Step by Step Solution

1. Step 1: Write the proportion equation
   661,279.50 : 989,361 = 989,361 : x
2. Step 2: Convert to fraction form
   661,279.50/989,361 = 989,361/x
3. Step 3: Cross multiply
   661,279.50x = 989,361 × 989,361
4. Step 4: Simplify right side
   661,279.50x = 978,835,188,321
5. Step 5: Solve for x
   x = 978,835,188,321/661,279.50
6. Step 6: Final answer
   x = 1,480,214.02