Finding the Fourth Proportional to 8,308.93, 12,423.30 and 8,112.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,308.93 : 12,423.30 = 8,112.10 : x
2. Step 2: Convert to fraction form
   8,308.93/12,423.30 = 8,112.10/x
3. Step 3: Cross multiply
   8,308.93x = 12,423.30 × 8,112.10
4. Step 4: Simplify right side
   8,308.93x = 100,779,051.93
5. Step 5: Solve for x
   x = 100,779,051.93/8,308.93
6. Step 6: Final answer
   x = 12,129.00