Finding the Fourth Proportional to 21,853.58, 30,160.28 and 13,360.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,853.58 : 30,160.28 = 13,360.69 : x
2. Step 2: Convert to fraction form
   21,853.58/30,160.28 = 13,360.69/x
3. Step 3: Cross multiply
   21,853.58x = 30,160.28 × 13,360.69
4. Step 4: Simplify right side
   21,853.58x = 402,962,109.39
5. Step 5: Solve for x
   x = 402,962,109.39/21,853.58
6. Step 6: Final answer
   x = 18,439.18