Finding the Fourth Proportional to 21,061.51, 31,455.71 and 19,083.19

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.51 : 31,455.71 = 19,083.19 : x
2. Step 2: Convert to fraction form
   21,061.51/31,455.71 = 19,083.19/x
3. Step 3: Cross multiply
   21,061.51x = 31,455.71 × 19,083.19
4. Step 4: Simplify right side
   21,061.51x = 600,275,290.51
5. Step 5: Solve for x
   x = 600,275,290.51/21,061.51
6. Step 6: Final answer
   x = 28,501.06