Finding the Third Proportional to 12,978 and 17,603

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978 : 17,603 = 17,603 : x
2. Step 2: Convert to fraction form
   12,978/17,603 = 17,603/x
3. Step 3: Cross multiply
   12,978x = 17,603 × 17,603
4. Step 4: Simplify right side
   12,978x = 309,865,609
5. Step 5: Solve for x
   x = 309,865,609/12,978
6. Step 6: Final answer
   x = 23,876.22