Finding the Third Proportional to 2,139.75 and 3,397.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.75 : 3,397.88 = 3,397.88 : x
2. Step 2: Convert to fraction form
   2,139.75/3,397.88 = 3,397.88/x
3. Step 3: Cross multiply
   2,139.75x = 3,397.88 × 3,397.88
4. Step 4: Simplify right side
   2,139.75x = 11,545,554.52
5. Step 5: Solve for x
   x = 11,545,554.52/2,139.75
6. Step 6: Final answer
   x = 5,395.75