Finding the Fourth Proportional to 8,972.10, 12,389.04 and 5,440.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,972.10 : 12,389.04 = 5,440.05 : x
2. Step 2: Convert to fraction form
   8,972.10/12,389.04 = 5,440.05/x
3. Step 3: Cross multiply
   8,972.10x = 12,389.04 × 5,440.05
4. Step 4: Simplify right side
   8,972.10x = 67,396,997.05
5. Step 5: Solve for x
   x = 67,396,997.05/8,972.10
6. Step 6: Final answer
   x = 7,511.84