Finding the Fourth Proportional to 8,872.90, 13,308.52 and 5,172.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,872.90 : 13,308.52 = 5,172.82 : x
2. Step 2: Convert to fraction form
   8,872.90/13,308.52 = 5,172.82/x
3. Step 3: Cross multiply
   8,872.90x = 13,308.52 × 5,172.82
4. Step 4: Simplify right side
   8,872.90x = 68,842,578.43
5. Step 5: Solve for x
   x = 68,842,578.43/8,872.90
6. Step 6: Final answer
   x = 7,758.75