Finding the Fourth Proportional to 12,356.42, 18,491.55 and 10,109.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,356.42 : 18,491.55 = 10,109.27 : x
2. Step 2: Convert to fraction form
   12,356.42/18,491.55 = 10,109.27/x
3. Step 3: Cross multiply
   12,356.42x = 18,491.55 × 10,109.27
4. Step 4: Simplify right side
   12,356.42x = 186,936,079.99
5. Step 5: Solve for x
   x = 186,936,079.99/12,356.42
6. Step 6: Final answer
   x = 15,128.67