Finding the Third Proportional to 21,478 and 30,246

Step by Step Solution

1. Step 1: Write the proportion equation
   21,478 : 30,246 = 30,246 : x
2. Step 2: Convert to fraction form
   21,478/30,246 = 30,246/x
3. Step 3: Cross multiply
   21,478x = 30,246 × 30,246
4. Step 4: Simplify right side
   21,478x = 914,820,516
5. Step 5: Solve for x
   x = 914,820,516/21,478
6. Step 6: Final answer
   x = 42,593.38