Finding the Third Proportional to 2,058 and 3,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,058 : 3,139.50 = 3,139.50 : x
2. Step 2: Convert to fraction form
   2,058/3,139.50 = 3,139.50/x
3. Step 3: Cross multiply
   2,058x = 3,139.50 × 3,139.50
4. Step 4: Simplify right side
   2,058x = 9,856,460.25
5. Step 5: Solve for x
   x = 9,856,460.25/2,058
6. Step 6: Final answer
   x = 4,789.34