Finding the Third Proportional to 1,821 and 3,901.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,821 : 3,901.69 = 3,901.69 : x
2. Step 2: Convert to fraction form
   1,821/3,901.69 = 3,901.69/x
3. Step 3: Cross multiply
   1,821x = 3,901.69 × 3,901.69
4. Step 4: Simplify right side
   1,821x = 15,223,165.35
5. Step 5: Solve for x
   x = 15,223,165.35/1,821
6. Step 6: Final answer
   x = 8,359.78