Finding the Third Proportional to 655,603.50 and 989,436

Step by Step Solution

1. Step 1: Write the proportion equation
   655,603.50 : 989,436 = 989,436 : x
2. Step 2: Convert to fraction form
   655,603.50/989,436 = 989,436/x
3. Step 3: Cross multiply
   655,603.50x = 989,436 × 989,436
4. Step 4: Simplify right side
   655,603.50x = 978,983,598,096
5. Step 5: Solve for x
   x = 978,983,598,096/655,603.50
6. Step 6: Final answer
   x = 1,493,255.60