Finding the Fourth Proportional to 12,116.91, 18,156.81 and 8,153.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,116.91 : 18,156.81 = 8,153.48 : x
2. Step 2: Convert to fraction form
   12,116.91/18,156.81 = 8,153.48/x
3. Step 3: Cross multiply
   12,116.91x = 18,156.81 × 8,153.48
4. Step 4: Simplify right side
   12,116.91x = 148,041,115.17
5. Step 5: Solve for x
   x = 148,041,115.17/12,116.91
6. Step 6: Final answer
   x = 12,217.73