Finding the Third Proportional to 13,090 and 21,072

Step by Step Solution

1. Step 1: Write the proportion equation
   13,090 : 21,072 = 21,072 : x
2. Step 2: Convert to fraction form
   13,090/21,072 = 21,072/x
3. Step 3: Cross multiply
   13,090x = 21,072 × 21,072
4. Step 4: Simplify right side
   13,090x = 444,029,184
5. Step 5: Solve for x
   x = 444,029,184/13,090
6. Step 6: Final answer
   x = 33,921.25