Finding the Third Proportional to 71,040 and 108,990

Step by Step Solution

1. Step 1: Write the proportion equation
   71,040 : 108,990 = 108,990 : x
2. Step 2: Convert to fraction form
   71,040/108,990 = 108,990/x
3. Step 3: Cross multiply
   71,040x = 108,990 × 108,990
4. Step 4: Simplify right side
   71,040x = 11,878,820,100
5. Step 5: Solve for x
   x = 11,878,820,100/71,040
6. Step 6: Final answer
   x = 167,213.12