Finding the Third Proportional to 3,453.47 and 5,476.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,453.47 : 5,476.78 = 5,476.78 : x
2. Step 2: Convert to fraction form
   3,453.47/5,476.78 = 5,476.78/x
3. Step 3: Cross multiply
   3,453.47x = 5,476.78 × 5,476.78
4. Step 4: Simplify right side
   3,453.47x = 29,995,132.86
5. Step 5: Solve for x
   x = 29,995,132.86/3,453.47
6. Step 6: Final answer
   x = 8,685.51