Finding the Fourth Proportional to 21,853.40, 30,160.00 and 13,360.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,853.40 : 30,160.00 = 13,360.49 : x
2. Step 2: Convert to fraction form
   21,853.40/30,160.00 = 13,360.49/x
3. Step 3: Cross multiply
   21,853.40x = 30,160.00 × 13,360.49
4. Step 4: Simplify right side
   21,853.40x = 402,952,451.90
5. Step 5: Solve for x
   x = 402,952,451.90/21,853.40
6. Step 6: Final answer
   x = 18,438.89