Finding the Third Proportional to 13,439.91 and 21,351.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,439.91 : 21,351.56 = 21,351.56 : x
2. Step 2: Convert to fraction form
   13,439.91/21,351.56 = 21,351.56/x
3. Step 3: Cross multiply
   13,439.91x = 21,351.56 × 21,351.56
4. Step 4: Simplify right side
   13,439.91x = 455,889,221.19
5. Step 5: Solve for x
   x = 455,889,221.19/13,439.91
6. Step 6: Final answer
   x = 33,920.57