Finding the Third Proportional to 21,931 and 53,028

Step by Step Solution

1. Step 1: Write the proportion equation
   21,931 : 53,028 = 53,028 : x
2. Step 2: Convert to fraction form
   21,931/53,028 = 53,028/x
3. Step 3: Cross multiply
   21,931x = 53,028 × 53,028
4. Step 4: Simplify right side
   21,931x = 2,811,968,784
5. Step 5: Solve for x
   x = 2,811,968,784/21,931
6. Step 6: Final answer
   x = 128,218.90