Finding the Third Proportional to 423,513.75 and 636,210

Step by Step Solution

1. Step 1: Write the proportion equation
   423,513.75 : 636,210 = 636,210 : x
2. Step 2: Convert to fraction form
   423,513.75/636,210 = 636,210/x
3. Step 3: Cross multiply
   423,513.75x = 636,210 × 636,210
4. Step 4: Simplify right side
   423,513.75x = 404,763,164,100
5. Step 5: Solve for x
   x = 404,763,164,100/423,513.75
6. Step 6: Final answer
   x = 955,726.15