Finding the Third Proportional to 2,129.75 and 3,123

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129.75 : 3,123 = 3,123 : x
2. Step 2: Convert to fraction form
   2,129.75/3,123 = 3,123/x
3. Step 3: Cross multiply
   2,129.75x = 3,123 × 3,123
4. Step 4: Simplify right side
   2,129.75x = 9,753,129
5. Step 5: Solve for x
   x = 9,753,129/2,129.75
6. Step 6: Final answer
   x = 4,579.47