Finding the Fourth Proportional to 8,270.76, 12,418.47 and 8,123.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,270.76 : 12,418.47 = 8,123.16 : x
2. Step 2: Convert to fraction form
   8,270.76/12,418.47 = 8,123.16/x
3. Step 3: Cross multiply
   8,270.76x = 12,418.47 × 8,123.16
4. Step 4: Simplify right side
   8,270.76x = 100,877,218.77
5. Step 5: Solve for x
   x = 100,877,218.77/8,270.76
6. Step 6: Final answer
   x = 12,196.85