Finding the Third Proportional to 8,520.19 and 21,247.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,520.19 : 21,247.31 = 21,247.31 : x
2. Step 2: Convert to fraction form
   8,520.19/21,247.31 = 21,247.31/x
3. Step 3: Cross multiply
   8,520.19x = 21,247.31 × 21,247.31
4. Step 4: Simplify right side
   8,520.19x = 451,448,288.47
5. Step 5: Solve for x
   x = 451,448,288.47/8,520.19
6. Step 6: Final answer
   x = 52,985.72