Finding the Fourth Proportional to 9,398.17, 12,971.15 and 5,419.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,398.17 : 12,971.15 = 5,419.45 : x
2. Step 2: Convert to fraction form
   9,398.17/12,971.15 = 5,419.45/x
3. Step 3: Cross multiply
   9,398.17x = 12,971.15 × 5,419.45
4. Step 4: Simplify right side
   9,398.17x = 70,296,498.87
5. Step 5: Solve for x
   x = 70,296,498.87/9,398.17
6. Step 6: Final answer
   x = 7,479.81