Finding the Third Proportional to 5,128.75 and 12,100.25

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128.75 : 12,100.25 = 12,100.25 : x
2. Step 2: Convert to fraction form
   5,128.75/12,100.25 = 12,100.25/x
3. Step 3: Cross multiply
   5,128.75x = 12,100.25 × 12,100.25
4. Step 4: Simplify right side
   5,128.75x = 146,416,050.06
5. Step 5: Solve for x
   x = 146,416,050.06/5,128.75
6. Step 6: Final answer
   x = 28,548.10