Finding the Fourth Proportional to 12,540.99, 18,820.53 and 10,105.23

Step by Step Solution

1. Step 1: Write the proportion equation
   12,540.99 : 18,820.53 = 10,105.23 : x
2. Step 2: Convert to fraction form
   12,540.99/18,820.53 = 10,105.23/x
3. Step 3: Cross multiply
   12,540.99x = 18,820.53 × 10,105.23
4. Step 4: Simplify right side
   12,540.99x = 190,185,784.37
5. Step 5: Solve for x
   x = 190,185,784.37/12,540.99
6. Step 6: Final answer
   x = 15,165.13