Finding the Fourth Proportional to 13,926.33, 19,205.51 and 12,920.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,926.33 : 19,205.51 = 12,920.31 : x
2. Step 2: Convert to fraction form
   13,926.33/19,205.51 = 12,920.31/x
3. Step 3: Cross multiply
   13,926.33x = 19,205.51 × 12,920.31
4. Step 4: Simplify right side
   13,926.33x = 248,141,078.31
5. Step 5: Solve for x
   x = 248,141,078.31/13,926.33
6. Step 6: Final answer
   x = 17,818.12