Finding the Fourth Proportional to 7,121.76, 10,680.89 and 3,225.39

Step by Step Solution

1. Step 1: Write the proportion equation
   7,121.76 : 10,680.89 = 3,225.39 : x
2. Step 2: Convert to fraction form
   7,121.76/10,680.89 = 3,225.39/x
3. Step 3: Cross multiply
   7,121.76x = 10,680.89 × 3,225.39
4. Step 4: Simplify right side
   7,121.76x = 34,450,019.67
5. Step 5: Solve for x
   x = 34,450,019.67/7,121.76
6. Step 6: Final answer
   x = 4,837.29