Finding the Third Proportional to 60,287.25 and 128,878

Step by Step Solution

1. Step 1: Write the proportion equation
   60,287.25 : 128,878 = 128,878 : x
2. Step 2: Convert to fraction form
   60,287.25/128,878 = 128,878/x
3. Step 3: Cross multiply
   60,287.25x = 128,878 × 128,878
4. Step 4: Simplify right side
   60,287.25x = 16,609,538,884
5. Step 5: Solve for x
   x = 16,609,538,884/60,287.25
6. Step 6: Final answer
   x = 275,506.66