Finding the Fourth Proportional to 9,412.88, 12,989.77 and 5,221.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,412.88 : 12,989.77 = 5,221.94 : x
2. Step 2: Convert to fraction form
   9,412.88/12,989.77 = 5,221.94/x
3. Step 3: Cross multiply
   9,412.88x = 12,989.77 × 5,221.94
4. Step 4: Simplify right side
   9,412.88x = 67,831,721.55
5. Step 5: Solve for x
   x = 67,831,721.55/9,412.88
6. Step 6: Final answer
   x = 7,206.27