Finding the Third Proportional to 291,210 and 636,300

Step by Step Solution

1. Step 1: Write the proportion equation
   291,210 : 636,300 = 636,300 : x
2. Step 2: Convert to fraction form
   291,210/636,300 = 636,300/x
3. Step 3: Cross multiply
   291,210x = 636,300 × 636,300
4. Step 4: Simplify right side
   291,210x = 404,877,690,000
5. Step 5: Solve for x
   x = 404,877,690,000/291,210
6. Step 6: Final answer
   x = 1,390,328.94