Finding the Fourth Proportional to 21,160.80, 31,742.22 and 17,456.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,160.80 : 31,742.22 = 17,456.17 : x
2. Step 2: Convert to fraction form
   21,160.80/31,742.22 = 17,456.17/x
3. Step 3: Cross multiply
   21,160.80x = 31,742.22 × 17,456.17
4. Step 4: Simplify right side
   21,160.80x = 554,097,588.50
5. Step 5: Solve for x
   x = 554,097,588.50/21,160.80
6. Step 6: Final answer
   x = 26,185.09