Finding the Third Proportional to 89,391 and 123,136.50

Step by Step Solution

1. Step 1: Write the proportion equation
   89,391 : 123,136.50 = 123,136.50 : x
2. Step 2: Convert to fraction form
   89,391/123,136.50 = 123,136.50/x
3. Step 3: Cross multiply
   89,391x = 123,136.50 × 123,136.50
4. Step 4: Simplify right side
   89,391x = 15,162,597,632.25
5. Step 5: Solve for x
   x = 15,162,597,632.25/89,391
6. Step 6: Final answer
   x = 169,621.08