Finding the Fourth Proportional to 8,989.92, 12,405.56 and 5,212.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,989.92 : 12,405.56 = 5,212.82 : x
2. Step 2: Convert to fraction form
   8,989.92/12,405.56 = 5,212.82/x
3. Step 3: Cross multiply
   8,989.92x = 12,405.56 × 5,212.82
4. Step 4: Simplify right side
   8,989.92x = 64,667,956.23
5. Step 5: Solve for x
   x = 64,667,956.23/8,989.92
6. Step 6: Final answer
   x = 7,193.39