Finding the Third Proportional to 13,890 and 21,513

Step by Step Solution

1. Step 1: Write the proportion equation
   13,890 : 21,513 = 21,513 : x
2. Step 2: Convert to fraction form
   13,890/21,513 = 21,513/x
3. Step 3: Cross multiply
   13,890x = 21,513 × 21,513
4. Step 4: Simplify right side
   13,890x = 462,809,169
5. Step 5: Solve for x
   x = 462,809,169/13,890
6. Step 6: Final answer
   x = 33,319.59