Finding the Third Proportional to 6,811.50 and 12,156

Step by Step Solution

1. Step 1: Write the proportion equation
   6,811.50 : 12,156 = 12,156 : x
2. Step 2: Convert to fraction form
   6,811.50/12,156 = 12,156/x
3. Step 3: Cross multiply
   6,811.50x = 12,156 × 12,156
4. Step 4: Simplify right side
   6,811.50x = 147,768,336
5. Step 5: Solve for x
   x = 147,768,336/6,811.50
6. Step 6: Final answer
   x = 21,693.95