Finding the Fourth Proportional to 8,920.91, 12,310.72 and 5,144.08

Step by Step Solution

1. Step 1: Write the proportion equation
   8,920.91 : 12,310.72 = 5,144.08 : x
2. Step 2: Convert to fraction form
   8,920.91/12,310.72 = 5,144.08/x
3. Step 3: Cross multiply
   8,920.91x = 12,310.72 × 5,144.08
4. Step 4: Simplify right side
   8,920.91x = 63,327,328.54
5. Step 5: Solve for x
   x = 63,327,328.54/8,920.91
6. Step 6: Final answer
   x = 7,098.75