Finding the Third Proportional to 12,390.47 and 17,663.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.47 : 17,663.06 = 17,663.06 : x
2. Step 2: Convert to fraction form
   12,390.47/17,663.06 = 17,663.06/x
3. Step 3: Cross multiply
   12,390.47x = 17,663.06 × 17,663.06
4. Step 4: Simplify right side
   12,390.47x = 311,983,776.88
5. Step 5: Solve for x
   x = 311,983,776.88/12,390.47
6. Step 6: Final answer
   x = 25,179.34