Finding the Third Proportional to 299,602 and 636,140

Step by Step Solution

1. Step 1: Write the proportion equation
   299,602 : 636,140 = 636,140 : x
2. Step 2: Convert to fraction form
   299,602/636,140 = 636,140/x
3. Step 3: Cross multiply
   299,602x = 636,140 × 636,140
4. Step 4: Simplify right side
   299,602x = 404,674,099,600
5. Step 5: Solve for x
   x = 404,674,099,600/299,602
6. Step 6: Final answer
   x = 1,350,705.60