Finding the Fourth Proportional to 6,811.69, 10,220.61 and 3,478.22

Step by Step Solution

1. Step 1: Write the proportion equation
   6,811.69 : 10,220.61 = 3,478.22 : x
2. Step 2: Convert to fraction form
   6,811.69/10,220.61 = 3,478.22/x
3. Step 3: Cross multiply
   6,811.69x = 10,220.61 × 3,478.22
4. Step 4: Simplify right side
   6,811.69x = 35,549,510.82
5. Step 5: Solve for x
   x = 35,549,510.82/6,811.69
6. Step 6: Final answer
   x = 5,218.90