Finding the Third Proportional to 1,820.40 and 3,981.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820.40 : 3,981.51 = 3,981.51 : x
2. Step 2: Convert to fraction form
   1,820.40/3,981.51 = 3,981.51/x
3. Step 3: Cross multiply
   1,820.40x = 3,981.51 × 3,981.51
4. Step 4: Simplify right side
   1,820.40x = 15,852,404.46
5. Step 5: Solve for x
   x = 15,852,404.46/1,820.40
6. Step 6: Final answer
   x = 8,708.21