Finding the Fourth Proportional to 21,306.52, 31,976.28 and 17,156.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,306.52 : 31,976.28 = 17,156.69 : x
2. Step 2: Convert to fraction form
   21,306.52/31,976.28 = 17,156.69/x
3. Step 3: Cross multiply
   21,306.52x = 31,976.28 × 17,156.69
4. Step 4: Simplify right side
   21,306.52x = 548,606,877.65
5. Step 5: Solve for x
   x = 548,606,877.65/21,306.52
6. Step 6: Final answer
   x = 25,748.32