Finding the Third Proportional to 2,391.19 and 3,690.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.19 : 3,690.56 = 3,690.56 : x
2. Step 2: Convert to fraction form
   2,391.19/3,690.56 = 3,690.56/x
3. Step 3: Cross multiply
   2,391.19x = 3,690.56 × 3,690.56
4. Step 4: Simplify right side
   2,391.19x = 13,620,251.57
5. Step 5: Solve for x
   x = 13,620,251.57/2,391.19
6. Step 6: Final answer
   x = 5,696.02