Finding the Third Proportional to 143,136 and 210,328

Step by Step Solution

1. Step 1: Write the proportion equation
   143,136 : 210,328 = 210,328 : x
2. Step 2: Convert to fraction form
   143,136/210,328 = 210,328/x
3. Step 3: Cross multiply
   143,136x = 210,328 × 210,328
4. Step 4: Simplify right side
   143,136x = 44,237,867,584
5. Step 5: Solve for x
   x = 44,237,867,584/143,136
6. Step 6: Final answer
   x = 309,061.78