Finding the Third Proportional to 21,038 and 43,128

Step by Step Solution

1. Step 1: Write the proportion equation
   21,038 : 43,128 = 43,128 : x
2. Step 2: Convert to fraction form
   21,038/43,128 = 43,128/x
3. Step 3: Cross multiply
   21,038x = 43,128 × 43,128
4. Step 4: Simplify right side
   21,038x = 1,860,024,384
5. Step 5: Solve for x
   x = 1,860,024,384/21,038
6. Step 6: Final answer
   x = 88,412.61