Finding the Third Proportional to 12,390.94 and 17,663.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.94 : 17,663.81 = 17,663.81 : x
2. Step 2: Convert to fraction form
   12,390.94/17,663.81 = 17,663.81/x
3. Step 3: Cross multiply
   12,390.94x = 17,663.81 × 17,663.81
4. Step 4: Simplify right side
   12,390.94x = 312,010,272.04
5. Step 5: Solve for x
   x = 312,010,272.04/12,390.94
6. Step 6: Final answer
   x = 25,180.52