Finding the Fourth Proportional to 8,312.10, 12,443.85 and 8,069.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,312.10 : 12,443.85 = 8,069.10 : x
2. Step 2: Convert to fraction form
   8,312.10/12,443.85 = 8,069.10/x
3. Step 3: Cross multiply
   8,312.10x = 12,443.85 × 8,069.10
4. Step 4: Simplify right side
   8,312.10x = 100,410,670.04
5. Step 5: Solve for x
   x = 100,410,670.04/8,312.10
6. Step 6: Final answer
   x = 12,080.06