Finding the Fourth Proportional to 13,897.72, 20,838.34 and 5,581.68

Step by Step Solution

1. Step 1: Write the proportion equation
   13,897.72 : 20,838.34 = 5,581.68 : x
2. Step 2: Convert to fraction form
   13,897.72/20,838.34 = 5,581.68/x
3. Step 3: Cross multiply
   13,897.72x = 20,838.34 × 5,581.68
4. Step 4: Simplify right side
   13,897.72x = 116,312,945.61
5. Step 5: Solve for x
   x = 116,312,945.61/13,897.72
6. Step 6: Final answer
   x = 8,369.21