Finding the Third Proportional to 656,838 and 989,956.50

Step by Step Solution

1. Step 1: Write the proportion equation
   656,838 : 989,956.50 = 989,956.50 : x
2. Step 2: Convert to fraction form
   656,838/989,956.50 = 989,956.50/x
3. Step 3: Cross multiply
   656,838x = 989,956.50 × 989,956.50
4. Step 4: Simplify right side
   656,838x = 980,013,871,892.25
5. Step 5: Solve for x
   x = 980,013,871,892.25/656,838
6. Step 6: Final answer
   x = 1,492,017.62