Finding the Third Proportional to 12,140 and 18,490

Step by Step Solution

1. Step 1: Write the proportion equation
   12,140 : 18,490 = 18,490 : x
2. Step 2: Convert to fraction form
   12,140/18,490 = 18,490/x
3. Step 3: Cross multiply
   12,140x = 18,490 × 18,490
4. Step 4: Simplify right side
   12,140x = 341,880,100
5. Step 5: Solve for x
   x = 341,880,100/12,140
6. Step 6: Final answer
   x = 28,161.46