Finding the Fourth Proportional to 9,404.40, 12,978.03 and 5,212.65

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.40 : 12,978.03 = 5,212.65 : x
2. Step 2: Convert to fraction form
   9,404.40/12,978.03 = 5,212.65/x
3. Step 3: Cross multiply
   9,404.40x = 12,978.03 × 5,212.65
4. Step 4: Simplify right side
   9,404.40x = 67,649,928.08
5. Step 5: Solve for x
   x = 67,649,928.08/9,404.40
6. Step 6: Final answer
   x = 7,193.43