Finding the Third Proportional to 128,215.50 and 188,160

Step by Step Solution

1. Step 1: Write the proportion equation
   128,215.50 : 188,160 = 188,160 : x
2. Step 2: Convert to fraction form
   128,215.50/188,160 = 188,160/x
3. Step 3: Cross multiply
   128,215.50x = 188,160 × 188,160
4. Step 4: Simplify right side
   128,215.50x = 35,404,185,600
5. Step 5: Solve for x
   x = 35,404,185,600/128,215.50
6. Step 6: Final answer
   x = 276,130.31