Finding the Third Proportional to 413,679 and 620,518.50

Step by Step Solution

1. Step 1: Write the proportion equation
   413,679 : 620,518.50 = 620,518.50 : x
2. Step 2: Convert to fraction form
   413,679/620,518.50 = 620,518.50/x
3. Step 3: Cross multiply
   413,679x = 620,518.50 × 620,518.50
4. Step 4: Simplify right side
   413,679x = 385,043,208,842.25
5. Step 5: Solve for x
   x = 385,043,208,842.25/413,679
6. Step 6: Final answer
   x = 930,777.75