Finding the Third Proportional to 1,071.25 and 2,171.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.25 : 2,171.75 = 2,171.75 : x
2. Step 2: Convert to fraction form
   1,071.25/2,171.75 = 2,171.75/x
3. Step 3: Cross multiply
   1,071.25x = 2,171.75 × 2,171.75
4. Step 4: Simplify right side
   1,071.25x = 4,716,498.06
5. Step 5: Solve for x
   x = 4,716,498.06/1,071.25
6. Step 6: Final answer
   x = 4,402.80