Finding the Fourth Proportional to 7,085.74, 10,618.52 and 5,222.20

Step by Step Solution

1. Step 1: Write the proportion equation
   7,085.74 : 10,618.52 = 5,222.20 : x
2. Step 2: Convert to fraction form
   7,085.74/10,618.52 = 5,222.20/x
3. Step 3: Cross multiply
   7,085.74x = 10,618.52 × 5,222.20
4. Step 4: Simplify right side
   7,085.74x = 55,452,035.14
5. Step 5: Solve for x
   x = 55,452,035.14/7,085.74
6. Step 6: Final answer
   x = 7,825.86