Finding the Third Proportional to 5,111.23 and 10,410.40

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.23 : 10,410.40 = 10,410.40 : x
2. Step 2: Convert to fraction form
   5,111.23/10,410.40 = 10,410.40/x
3. Step 3: Cross multiply
   5,111.23x = 10,410.40 × 10,410.40
4. Step 4: Simplify right side
   5,111.23x = 108,376,395.63
5. Step 5: Solve for x
   x = 108,376,395.63/5,111.23
6. Step 6: Final answer
   x = 21,203.60