Finding the Third Proportional to 82,769.63 and 128,136

Step by Step Solution

1. Step 1: Write the proportion equation
   82,769.63 : 128,136 = 128,136 : x
2. Step 2: Convert to fraction form
   82,769.63/128,136 = 128,136/x
3. Step 3: Cross multiply
   82,769.63x = 128,136 × 128,136
4. Step 4: Simplify right side
   82,769.63x = 16,418,834,496
5. Step 5: Solve for x
   x = 16,418,834,496/82,769.63
6. Step 6: Final answer
   x = 198,367.87