Finding the Third Proportional to 13,218 and 20,470.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,218 : 20,470.50 = 20,470.50 : x
2. Step 2: Convert to fraction form
   13,218/20,470.50 = 20,470.50/x
3. Step 3: Cross multiply
   13,218x = 20,470.50 × 20,470.50
4. Step 4: Simplify right side
   13,218x = 419,041,370.25
5. Step 5: Solve for x
   x = 419,041,370.25/13,218
6. Step 6: Final answer
   x = 31,702.33