Finding the Third Proportional to 1,390.37 and 2,819.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.37 : 2,819.18 = 2,819.18 : x
2. Step 2: Convert to fraction form
   1,390.37/2,819.18 = 2,819.18/x
3. Step 3: Cross multiply
   1,390.37x = 2,819.18 × 2,819.18
4. Step 4: Simplify right side
   1,390.37x = 7,947,774.11
5. Step 5: Solve for x
   x = 7,947,774.11/1,390.37
6. Step 6: Final answer
   x = 5,716.31