Finding the Third Proportional to 20,440 and 42,938

Step by Step Solution

1. Step 1: Write the proportion equation
   20,440 : 42,938 = 42,938 : x
2. Step 2: Convert to fraction form
   20,440/42,938 = 42,938/x
3. Step 3: Cross multiply
   20,440x = 42,938 × 42,938
4. Step 4: Simplify right side
   20,440x = 1,843,671,844
5. Step 5: Solve for x
   x = 1,843,671,844/20,440
6. Step 6: Final answer
   x = 90,199.21