Finding the Third Proportional to 1,820.81 and 3,936.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820.81 : 3,936.94 = 3,936.94 : x
2. Step 2: Convert to fraction form
   1,820.81/3,936.94 = 3,936.94/x
3. Step 3: Cross multiply
   1,820.81x = 3,936.94 × 3,936.94
4. Step 4: Simplify right side
   1,820.81x = 15,499,476.88
5. Step 5: Solve for x
   x = 15,499,476.88/1,820.81
6. Step 6: Final answer
   x = 8,512.40