Finding the Third Proportional to 1,679.06 and 3,639.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,679.06 : 3,639.94 = 3,639.94 : x
2. Step 2: Convert to fraction form
   1,679.06/3,639.94 = 3,639.94/x
3. Step 3: Cross multiply
   1,679.06x = 3,639.94 × 3,639.94
4. Step 4: Simplify right side
   1,679.06x = 13,249,145.00
5. Step 5: Solve for x
   x = 13,249,145.00/1,679.06
6. Step 6: Final answer
   x = 7,890.80