Finding the Fourth Proportional to 8,919.36, 12,308.68 and 5,142.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,919.36 : 12,308.68 = 5,142.50 : x
2. Step 2: Convert to fraction form
   8,919.36/12,308.68 = 5,142.50/x
3. Step 3: Cross multiply
   8,919.36x = 12,308.68 × 5,142.50
4. Step 4: Simplify right side
   8,919.36x = 63,297,404.82
5. Step 5: Solve for x
   x = 63,297,404.82/8,919.36
6. Step 6: Final answer
   x = 7,096.63