Finding the Third Proportional to 1,139.50 and 2,091.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.50 : 2,091.75 = 2,091.75 : x
2. Step 2: Convert to fraction form
   1,139.50/2,091.75 = 2,091.75/x
3. Step 3: Cross multiply
   1,139.50x = 2,091.75 × 2,091.75
4. Step 4: Simplify right side
   1,139.50x = 4,375,418.06
5. Step 5: Solve for x
   x = 4,375,418.06/1,139.50
6. Step 6: Final answer
   x = 3,839.77