Finding the Third Proportional to 855 and 1,300.50

Step by Step Solution

1. Step 1: Write the proportion equation
   855 : 1,300.50 = 1,300.50 : x
2. Step 2: Convert to fraction form
   855/1,300.50 = 1,300.50/x
3. Step 3: Cross multiply
   855x = 1,300.50 × 1,300.50
4. Step 4: Simplify right side
   855x = 1,691,300.25
5. Step 5: Solve for x
   x = 1,691,300.25/855
6. Step 6: Final answer
   x = 1,978.13