Finding the Third Proportional to 12,156 and 28,620

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156 : 28,620 = 28,620 : x
2. Step 2: Convert to fraction form
   12,156/28,620 = 28,620/x
3. Step 3: Cross multiply
   12,156x = 28,620 × 28,620
4. Step 4: Simplify right side
   12,156x = 819,104,400
5. Step 5: Solve for x
   x = 819,104,400/12,156
6. Step 6: Final answer
   x = 67,382.72