Finding the Third Proportional to 299,436 and 648,718.50

Step by Step Solution

1. Step 1: Write the proportion equation
   299,436 : 648,718.50 = 648,718.50 : x
2. Step 2: Convert to fraction form
   299,436/648,718.50 = 648,718.50/x
3. Step 3: Cross multiply
   299,436x = 648,718.50 × 648,718.50
4. Step 4: Simplify right side
   299,436x = 420,835,692,242.25
5. Step 5: Solve for x
   x = 420,835,692,242.25/299,436
6. Step 6: Final answer
   x = 1,405,427.85