Finding the Third Proportional to 1,789.88 and 3,920.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,789.88 : 3,920.63 = 3,920.63 : x
2. Step 2: Convert to fraction form
   1,789.88/3,920.63 = 3,920.63/x
3. Step 3: Cross multiply
   1,789.88x = 3,920.63 × 3,920.63
4. Step 4: Simplify right side
   1,789.88x = 15,371,300.39
5. Step 5: Solve for x
   x = 15,371,300.39/1,789.88
6. Step 6: Final answer
   x = 8,587.92