Finding the Third Proportional to 62,609.50 and 128,099

Step by Step Solution

1. Step 1: Write the proportion equation
   62,609.50 : 128,099 = 128,099 : x
2. Step 2: Convert to fraction form
   62,609.50/128,099 = 128,099/x
3. Step 3: Cross multiply
   62,609.50x = 128,099 × 128,099
4. Step 4: Simplify right side
   62,609.50x = 16,409,353,801
5. Step 5: Solve for x
   x = 16,409,353,801/62,609.50
6. Step 6: Final answer
   x = 262,090.48