Finding the Third Proportional to 10,221.19 and 18,685.69

Step by Step Solution

1. Step 1: Write the proportion equation
   10,221.19 : 18,685.69 = 18,685.69 : x
2. Step 2: Convert to fraction form
   10,221.19/18,685.69 = 18,685.69/x
3. Step 3: Cross multiply
   10,221.19x = 18,685.69 × 18,685.69
4. Step 4: Simplify right side
   10,221.19x = 349,154,917.35
5. Step 5: Solve for x
   x = 349,154,917.35/10,221.19
6. Step 6: Final answer
   x = 34,159.92