Finding the Third Proportional to 21,117 and 28,429

Step by Step Solution

1. Step 1: Write the proportion equation
   21,117 : 28,429 = 28,429 : x
2. Step 2: Convert to fraction form
   21,117/28,429 = 28,429/x
3. Step 3: Cross multiply
   21,117x = 28,429 × 28,429
4. Step 4: Simplify right side
   21,117x = 808,208,041
5. Step 5: Solve for x
   x = 808,208,041/21,117
6. Step 6: Final answer
   x = 38,272.86