Finding the Third Proportional to 6,405.75 and 8,636.25

Step by Step Solution

1. Step 1: Write the proportion equation
   6,405.75 : 8,636.25 = 8,636.25 : x
2. Step 2: Convert to fraction form
   6,405.75/8,636.25 = 8,636.25/x
3. Step 3: Cross multiply
   6,405.75x = 8,636.25 × 8,636.25
4. Step 4: Simplify right side
   6,405.75x = 74,584,814.06
5. Step 5: Solve for x
   x = 74,584,814.06/6,405.75
6. Step 6: Final answer
   x = 11,643.42