Finding the Third Proportional to 2,905.88 and 4,128.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,905.88 : 4,128.75 = 4,128.75 : x
2. Step 2: Convert to fraction form
   2,905.88/4,128.75 = 4,128.75/x
3. Step 3: Cross multiply
   2,905.88x = 4,128.75 × 4,128.75
4. Step 4: Simplify right side
   2,905.88x = 17,046,576.56
5. Step 5: Solve for x
   x = 17,046,576.56/2,905.88
6. Step 6: Final answer
   x = 5,866.25