Finding the Fourth Proportional to 9,399.86, 12,968.90 and 5,420.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.86 : 12,968.90 = 5,420.48 : x
2. Step 2: Convert to fraction form
   9,399.86/12,968.90 = 5,420.48/x
3. Step 3: Cross multiply
   9,399.86x = 12,968.90 × 5,420.48
4. Step 4: Simplify right side
   9,399.86x = 70,297,663.07
5. Step 5: Solve for x
   x = 70,297,663.07/9,399.86
6. Step 6: Final answer
   x = 7,478.59