Finding the Fourth Proportional to 8,921.41, 12,310.38 and 5,144.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,921.41 : 12,310.38 = 5,144.72 : x
2. Step 2: Convert to fraction form
   8,921.41/12,310.38 = 5,144.72/x
3. Step 3: Cross multiply
   8,921.41x = 12,310.38 × 5,144.72
4. Step 4: Simplify right side
   8,921.41x = 63,333,396.64
5. Step 5: Solve for x
   x = 63,333,396.64/8,921.41
6. Step 6: Final answer
   x = 7,099.04