Finding the Fourth Proportional to 9,397.91, 12,968.34 and 5,418.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,397.91 : 12,968.34 = 5,418.78 : x
2. Step 2: Convert to fraction form
   9,397.91/12,968.34 = 5,418.78/x
3. Step 3: Cross multiply
   9,397.91x = 12,968.34 × 5,418.78
4. Step 4: Simplify right side
   9,397.91x = 70,272,581.43
5. Step 5: Solve for x
   x = 70,272,581.43/9,397.91
6. Step 6: Final answer
   x = 7,477.47