Finding the Third Proportional to 292,418 and 637,683.50

Step by Step Solution

1. Step 1: Write the proportion equation
   292,418 : 637,683.50 = 637,683.50 : x
2. Step 2: Convert to fraction form
   292,418/637,683.50 = 637,683.50/x
3. Step 3: Cross multiply
   292,418x = 637,683.50 × 637,683.50
4. Step 4: Simplify right side
   292,418x = 406,640,246,172.25
5. Step 5: Solve for x
   x = 406,640,246,172.25/292,418
6. Step 6: Final answer
   x = 1,390,612.91