Finding the Fourth Proportional to 19,128.69, 26,400.02 and 12,055.05

Step by Step Solution

1. Step 1: Write the proportion equation
   19,128.69 : 26,400.02 = 12,055.05 : x
2. Step 2: Convert to fraction form
   19,128.69/26,400.02 = 12,055.05/x
3. Step 3: Cross multiply
   19,128.69x = 26,400.02 × 12,055.05
4. Step 4: Simplify right side
   19,128.69x = 318,253,500.83
5. Step 5: Solve for x
   x = 318,253,500.83/19,128.69
6. Step 6: Final answer
   x = 16,637.50