Finding the Third Proportional to 3,128.63 and 4,258.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.63 : 4,258.69 = 4,258.69 : x
2. Step 2: Convert to fraction form
   3,128.63/4,258.69 = 4,258.69/x
3. Step 3: Cross multiply
   3,128.63x = 4,258.69 × 4,258.69
4. Step 4: Simplify right side
   3,128.63x = 18,136,419.22
5. Step 5: Solve for x
   x = 18,136,419.22/3,128.63
6. Step 6: Final answer
   x = 5,796.93