Finding the Third Proportional to 11,145.94 and 12,421.69

Step by Step Solution

1. Step 1: Write the proportion equation
   11,145.94 : 12,421.69 = 12,421.69 : x
2. Step 2: Convert to fraction form
   11,145.94/12,421.69 = 12,421.69/x
3. Step 3: Cross multiply
   11,145.94x = 12,421.69 × 12,421.69
4. Step 4: Simplify right side
   11,145.94x = 154,298,320.35
5. Step 5: Solve for x
   x = 154,298,320.35/11,145.94
6. Step 6: Final answer
   x = 13,843.46