Finding the Third Proportional to 9,880 and 10,840

Step by Step Solution

1. Step 1: Write the proportion equation
   9,880 : 10,840 = 10,840 : x
2. Step 2: Convert to fraction form
   9,880/10,840 = 10,840/x
3. Step 3: Cross multiply
   9,880x = 10,840 × 10,840
4. Step 4: Simplify right side
   9,880x = 117,505,600
5. Step 5: Solve for x
   x = 117,505,600/9,880
6. Step 6: Final answer
   x = 11,893.28