Finding the Third Proportional to 82,778.63 and 128,147.06

Step by Step Solution

1. Step 1: Write the proportion equation
   82,778.63 : 128,147.06 = 128,147.06 : x
2. Step 2: Convert to fraction form
   82,778.63/128,147.06 = 128,147.06/x
3. Step 3: Cross multiply
   82,778.63x = 128,147.06 × 128,147.06
4. Step 4: Simplify right side
   82,778.63x = 16,421,669,627.38
5. Step 5: Solve for x
   x = 16,421,669,627.38/82,778.63
6. Step 6: Final answer
   x = 198,380.56