Finding the Fourth Proportional to 8,919.19, 12,308.45 and 5,142.33

Step by Step Solution

1. Step 1: Write the proportion equation
   8,919.19 : 12,308.45 = 5,142.33 : x
2. Step 2: Convert to fraction form
   8,919.19/12,308.45 = 5,142.33/x
3. Step 3: Cross multiply
   8,919.19x = 12,308.45 × 5,142.33
4. Step 4: Simplify right side
   8,919.19x = 63,294,111.69
5. Step 5: Solve for x
   x = 63,294,111.69/8,919.19
6. Step 6: Final answer
   x = 7,096.40