Finding the Fourth Proportional to 9,196.18, 12,690.61 and 5,419.51

Step by Step Solution

1. Step 1: Write the proportion equation
   9,196.18 : 12,690.61 = 5,419.51 : x
2. Step 2: Convert to fraction form
   9,196.18/12,690.61 = 5,419.51/x
3. Step 3: Cross multiply
   9,196.18x = 12,690.61 × 5,419.51
4. Step 4: Simplify right side
   9,196.18x = 68,776,839.05
5. Step 5: Solve for x
   x = 68,776,839.05/9,196.18
6. Step 6: Final answer
   x = 7,478.85