Finding the Fourth Proportional to 12,722.84, 19,078.68 and 5,221.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,722.84 : 19,078.68 = 5,221.25 : x
2. Step 2: Convert to fraction form
   12,722.84/19,078.68 = 5,221.25/x
3. Step 3: Cross multiply
   12,722.84x = 19,078.68 × 5,221.25
4. Step 4: Simplify right side
   12,722.84x = 99,614,462.56
5. Step 5: Solve for x
   x = 99,614,462.56/12,722.84
6. Step 6: Final answer
   x = 7,829.58