Finding the Third Proportional to 306,828 and 656,302.50

Step by Step Solution

1. Step 1: Write the proportion equation
   306,828 : 656,302.50 = 656,302.50 : x
2. Step 2: Convert to fraction form
   306,828/656,302.50 = 656,302.50/x
3. Step 3: Cross multiply
   306,828x = 656,302.50 × 656,302.50
4. Step 4: Simplify right side
   306,828x = 430,732,971,506.25
5. Step 5: Solve for x
   x = 430,732,971,506.25/306,828
6. Step 6: Final answer
   x = 1,403,825.50