Finding the Third Proportional to 13,618 and 19,886.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,618 : 19,886.50 = 19,886.50 : x
2. Step 2: Convert to fraction form
   13,618/19,886.50 = 19,886.50/x
3. Step 3: Cross multiply
   13,618x = 19,886.50 × 19,886.50
4. Step 4: Simplify right side
   13,618x = 395,472,882.25
5. Step 5: Solve for x
   x = 395,472,882.25/13,618
6. Step 6: Final answer
   x = 29,040.45