Finding the Third Proportional to 3,660.19 and 8,637.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,660.19 : 8,637.89 = 8,637.89 : x
2. Step 2: Convert to fraction form
   3,660.19/8,637.89 = 8,637.89/x
3. Step 3: Cross multiply
   3,660.19x = 8,637.89 × 8,637.89
4. Step 4: Simplify right side
   3,660.19x = 74,613,154.45
5. Step 5: Solve for x
   x = 74,613,154.45/3,660.19
6. Step 6: Final answer
   x = 20,385.06