Finding the Fourth Proportional to 21,083.18, 31,559.16 and 13,275.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,083.18 : 31,559.16 = 13,275.59 : x
2. Step 2: Convert to fraction form
   21,083.18/31,559.16 = 13,275.59/x
3. Step 3: Cross multiply
   21,083.18x = 31,559.16 × 13,275.59
4. Step 4: Simplify right side
   21,083.18x = 418,966,468.90
5. Step 5: Solve for x
   x = 418,966,468.90/21,083.18
6. Step 6: Final answer
   x = 19,872.07