Finding the Fourth Proportional to 9,404.54, 12,978.30 and 5,212.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.54 : 12,978.30 = 5,212.79 : x
2. Step 2: Convert to fraction form
   9,404.54/12,978.30 = 5,212.79/x
3. Step 3: Cross multiply
   9,404.54x = 12,978.30 × 5,212.79
4. Step 4: Simplify right side
   9,404.54x = 67,653,087.57
5. Step 5: Solve for x
   x = 67,653,087.57/9,404.54
6. Step 6: Final answer
   x = 7,193.67