Finding the Third Proportional to 300,921 and 655,822.50

Step by Step Solution

1. Step 1: Write the proportion equation
   300,921 : 655,822.50 = 655,822.50 : x
2. Step 2: Convert to fraction form
   300,921/655,822.50 = 655,822.50/x
3. Step 3: Cross multiply
   300,921x = 655,822.50 × 655,822.50
4. Step 4: Simplify right side
   300,921x = 430,103,151,506.25
5. Step 5: Solve for x
   x = 430,103,151,506.25/300,921
6. Step 6: Final answer
   x = 1,429,289.25