Finding the Third Proportional to 18,905 and 40,978

Step by Step Solution

1. Step 1: Write the proportion equation
   18,905 : 40,978 = 40,978 : x
2. Step 2: Convert to fraction form
   18,905/40,978 = 40,978/x
3. Step 3: Cross multiply
   18,905x = 40,978 × 40,978
4. Step 4: Simplify right side
   18,905x = 1,679,196,484
5. Step 5: Solve for x
   x = 1,679,196,484/18,905
6. Step 6: Final answer
   x = 88,822.88