Finding the Fourth Proportional to 7,074.99, 9,753.72 and 5,644.21

Step by Step Solution

1. Step 1: Write the proportion equation
   7,074.99 : 9,753.72 = 5,644.21 : x
2. Step 2: Convert to fraction form
   7,074.99/9,753.72 = 5,644.21/x
3. Step 3: Cross multiply
   7,074.99x = 9,753.72 × 5,644.21
4. Step 4: Simplify right side
   7,074.99x = 55,052,019.58
5. Step 5: Solve for x
   x = 55,052,019.58/7,074.99
6. Step 6: Final answer
   x = 7,781.22