Finding the Third Proportional to 8,155.69 and 12,987.84

Step by Step Solution

1. Step 1: Write the proportion equation
   8,155.69 : 12,987.84 = 12,987.84 : x
2. Step 2: Convert to fraction form
   8,155.69/12,987.84 = 12,987.84/x
3. Step 3: Cross multiply
   8,155.69x = 12,987.84 × 12,987.84
4. Step 4: Simplify right side
   8,155.69x = 168,684,085.27
5. Step 5: Solve for x
   x = 168,684,085.27/8,155.69
6. Step 6: Final answer
   x = 20,683.00