Finding the Fourth Proportional to 21,047.31, 31,564.65 and 17,340.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,047.31 : 31,564.65 = 17,340.33 : x
2. Step 2: Convert to fraction form
   21,047.31/31,564.65 = 17,340.33/x
3. Step 3: Cross multiply
   21,047.31x = 31,564.65 × 17,340.33
4. Step 4: Simplify right side
   21,047.31x = 547,341,447.33
5. Step 5: Solve for x
   x = 547,341,447.33/21,047.31
6. Step 6: Final answer
   x = 26,005.29