Finding the Third Proportional to 5,518.06 and 8,404.63

Step by Step Solution

1. Step 1: Write the proportion equation
   5,518.06 : 8,404.63 = 8,404.63 : x
2. Step 2: Convert to fraction form
   5,518.06/8,404.63 = 8,404.63/x
3. Step 3: Cross multiply
   5,518.06x = 8,404.63 × 8,404.63
4. Step 4: Simplify right side
   5,518.06x = 70,637,721.39
5. Step 5: Solve for x
   x = 70,637,721.39/5,518.06
6. Step 6: Final answer
   x = 12,801.18