Finding the Fourth Proportional to 5,215.30, 7,825.41 and 2,620.06

Step by Step Solution

1. Step 1: Write the proportion equation
   5,215.30 : 7,825.41 = 2,620.06 : x
2. Step 2: Convert to fraction form
   5,215.30/7,825.41 = 2,620.06/x
3. Step 3: Cross multiply
   5,215.30x = 7,825.41 × 2,620.06
4. Step 4: Simplify right side
   5,215.30x = 20,503,043.72
5. Step 5: Solve for x
   x = 20,503,043.72/5,215.30
6. Step 6: Final answer
   x = 3,931.33