Finding the Fourth Proportional to 21,644.69, 32,470.46 and 9,164.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,644.69 : 32,470.46 = 9,164.79 : x
2. Step 2: Convert to fraction form
   21,644.69/32,470.46 = 9,164.79/x
3. Step 3: Cross multiply
   21,644.69x = 32,470.46 × 9,164.79
4. Step 4: Simplify right side
   21,644.69x = 297,584,947.10
5. Step 5: Solve for x
   x = 297,584,947.10/21,644.69
6. Step 6: Final answer
   x = 13,748.64