Finding the Third Proportional to 58,500 and 128,100

Step by Step Solution

1. Step 1: Write the proportion equation
   58,500 : 128,100 = 128,100 : x
2. Step 2: Convert to fraction form
   58,500/128,100 = 128,100/x
3. Step 3: Cross multiply
   58,500x = 128,100 × 128,100
4. Step 4: Simplify right side
   58,500x = 16,409,610,000
5. Step 5: Solve for x
   x = 16,409,610,000/58,500
6. Step 6: Final answer
   x = 280,506.15