Finding the Fourth Proportional to 9,390.69, 12,959.78 and 5,412.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,390.69 : 12,959.78 = 5,412.06 : x
2. Step 2: Convert to fraction form
   9,390.69/12,959.78 = 5,412.06/x
3. Step 3: Cross multiply
   9,390.69x = 12,959.78 × 5,412.06
4. Step 4: Simplify right side
   9,390.69x = 70,139,089.80
5. Step 5: Solve for x
   x = 70,139,089.80/9,390.69
6. Step 6: Final answer
   x = 7,469.00