Finding the Third Proportional to 143,136 and 215,676

Step by Step Solution

1. Step 1: Write the proportion equation
   143,136 : 215,676 = 215,676 : x
2. Step 2: Convert to fraction form
   143,136/215,676 = 215,676/x
3. Step 3: Cross multiply
   143,136x = 215,676 × 215,676
4. Step 4: Simplify right side
   143,136x = 46,516,136,976
5. Step 5: Solve for x
   x = 46,516,136,976/143,136
6. Step 6: Final answer
   x = 324,978.60