Finding the Third Proportional to 7,880 and 12,360

Step by Step Solution

1. Step 1: Write the proportion equation
   7,880 : 12,360 = 12,360 : x
2. Step 2: Convert to fraction form
   7,880/12,360 = 12,360/x
3. Step 3: Cross multiply
   7,880x = 12,360 × 12,360
4. Step 4: Simplify right side
   7,880x = 152,769,600
5. Step 5: Solve for x
   x = 152,769,600/7,880
6. Step 6: Final answer
   x = 19,387.01