Finding the Fourth Proportional to 5,521.35, 7,620.56 and 3,131.37

Step by Step Solution

1. Step 1: Write the proportion equation
   5,521.35 : 7,620.56 = 3,131.37 : x
2. Step 2: Convert to fraction form
   5,521.35/7,620.56 = 3,131.37/x
3. Step 3: Cross multiply
   5,521.35x = 7,620.56 × 3,131.37
4. Step 4: Simplify right side
   5,521.35x = 23,862,792.97
5. Step 5: Solve for x
   x = 23,862,792.97/5,521.35
6. Step 6: Final answer
   x = 4,321.91