Finding the Third Proportional to 21,155 and 31,003

Step by Step Solution

1. Step 1: Write the proportion equation
   21,155 : 31,003 = 31,003 : x
2. Step 2: Convert to fraction form
   21,155/31,003 = 31,003/x
3. Step 3: Cross multiply
   21,155x = 31,003 × 31,003
4. Step 4: Simplify right side
   21,155x = 961,186,009
5. Step 5: Solve for x
   x = 961,186,009/21,155
6. Step 6: Final answer
   x = 45,435.41