Finding the Fourth Proportional to 9,412.47, 12,989.61 and 5,221.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,412.47 : 12,989.61 = 5,221.53 : x
2. Step 2: Convert to fraction form
   9,412.47/12,989.61 = 5,221.53/x
3. Step 3: Cross multiply
   9,412.47x = 12,989.61 × 5,221.53
4. Step 4: Simplify right side
   9,412.47x = 67,825,638.30
5. Step 5: Solve for x
   x = 67,825,638.30/9,412.47
6. Step 6: Final answer
   x = 7,205.93