Finding the Third Proportional to 21,175 and 31,129

Step by Step Solution

1. Step 1: Write the proportion equation
   21,175 : 31,129 = 31,129 : x
2. Step 2: Convert to fraction form
   21,175/31,129 = 31,129/x
3. Step 3: Cross multiply
   21,175x = 31,129 × 31,129
4. Step 4: Simplify right side
   21,175x = 969,014,641
5. Step 5: Solve for x
   x = 969,014,641/21,175
6. Step 6: Final answer
   x = 45,762.20