Finding the Third Proportional to 12,415.78 and 19,636.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,415.78 : 19,636.17 = 19,636.17 : x
2. Step 2: Convert to fraction form
   12,415.78/19,636.17 = 19,636.17/x
3. Step 3: Cross multiply
   12,415.78x = 19,636.17 × 19,636.17
4. Step 4: Simplify right side
   12,415.78x = 385,579,245.90
5. Step 5: Solve for x
   x = 385,579,245.90/12,415.78
6. Step 6: Final answer
   x = 31,055.58