Finding the Third Proportional to 11,421 and 17,931.38

Step by Step Solution

1. Step 1: Write the proportion equation
   11,421 : 17,931.38 = 17,931.38 : x
2. Step 2: Convert to fraction form
   11,421/17,931.38 = 17,931.38/x
3. Step 3: Cross multiply
   11,421x = 17,931.38 × 17,931.38
4. Step 4: Simplify right side
   11,421x = 321,534,209.39
5. Step 5: Solve for x
   x = 321,534,209.39/11,421
6. Step 6: Final answer
   x = 28,152.89