Finding the Fourth Proportional to 3,620.82, 5,428.56 and 2,447.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,620.82 : 5,428.56 = 2,447.91 : x
2. Step 2: Convert to fraction form
   3,620.82/5,428.56 = 2,447.91/x
3. Step 3: Cross multiply
   3,620.82x = 5,428.56 × 2,447.91
4. Step 4: Simplify right side
   3,620.82x = 13,288,626.31
5. Step 5: Solve for x
   x = 13,288,626.31/3,620.82
6. Step 6: Final answer
   x = 3,670.06