Finding the Third Proportional to 1,339.75 and 2,131.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.75 : 2,131.88 = 2,131.88 : x
2. Step 2: Convert to fraction form
   1,339.75/2,131.88 = 2,131.88/x
3. Step 3: Cross multiply
   1,339.75x = 2,131.88 × 2,131.88
4. Step 4: Simplify right side
   1,339.75x = 4,544,891.02
5. Step 5: Solve for x
   x = 4,544,891.02/1,339.75
6. Step 6: Final answer
   x = 3,392.34