Finding the Third Proportional to 978,646.50 and 2,155,972.50

Step by Step Solution

1. Step 1: Write the proportion equation
   978,646.50 : 2,155,972.50 = 2,155,972.50 : x
2. Step 2: Convert to fraction form
   978,646.50/2,155,972.50 = 2,155,972.50/x
3. Step 3: Cross multiply
   978,646.50x = 2,155,972.50 × 2,155,972.50
4. Step 4: Simplify right side
   978,646.50x = 4,648,217,420,756.25
5. Step 5: Solve for x
   x = 4,648,217,420,756.25/978,646.50
6. Step 6: Final answer
   x = 4,749,638.83