Finding the Third Proportional to 700 and 1,690.50

Step by Step Solution

1. Step 1: Write the proportion equation
   700 : 1,690.50 = 1,690.50 : x
2. Step 2: Convert to fraction form
   700/1,690.50 = 1,690.50/x
3. Step 3: Cross multiply
   700x = 1,690.50 × 1,690.50
4. Step 4: Simplify right side
   700x = 2,857,790.25
5. Step 5: Solve for x
   x = 2,857,790.25/700
6. Step 6: Final answer
   x = 4,082.56