Finding the Third Proportional to 21,517 and 30,247.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,517 : 30,247.50 = 30,247.50 : x
2. Step 2: Convert to fraction form
   21,517/30,247.50 = 30,247.50/x
3. Step 3: Cross multiply
   21,517x = 30,247.50 × 30,247.50
4. Step 4: Simplify right side
   21,517x = 914,911,256.25
5. Step 5: Solve for x
   x = 914,911,256.25/21,517
6. Step 6: Final answer
   x = 42,520.39