Finding the Fourth Proportional to 8,996.40, 12,408.12 and 7,812.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,996.40 : 12,408.12 = 7,812.72 : x
2. Step 2: Convert to fraction form
   8,996.40/12,408.12 = 7,812.72/x
3. Step 3: Cross multiply
   8,996.40x = 12,408.12 × 7,812.72
4. Step 4: Simplify right side
   8,996.40x = 96,941,167.29
5. Step 5: Solve for x
   x = 96,941,167.29/8,996.40
6. Step 6: Final answer
   x = 10,775.55