Finding the Third Proportional to 12,987 and 18,994.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,987 : 18,994.50 = 18,994.50 : x
2. Step 2: Convert to fraction form
   12,987/18,994.50 = 18,994.50/x
3. Step 3: Cross multiply
   12,987x = 18,994.50 × 18,994.50
4. Step 4: Simplify right side
   12,987x = 360,791,030.25
5. Step 5: Solve for x
   x = 360,791,030.25/12,987
6. Step 6: Final answer
   x = 27,780.94