Finding the Fourth Proportional to 9,404.29, 12,978.39 and 5,212.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.29 : 12,978.39 = 5,212.54 : x
2. Step 2: Convert to fraction form
   9,404.29/12,978.39 = 5,212.54/x
3. Step 3: Cross multiply
   9,404.29x = 12,978.39 × 5,212.54
4. Step 4: Simplify right side
   9,404.29x = 67,650,377.01
5. Step 5: Solve for x
   x = 67,650,377.01/9,404.29
6. Step 6: Final answer
   x = 7,193.57