Finding the Fourth Proportional to 13,191.72, 19,789.53 and 3,831.81

Step by Step Solution

1. Step 1: Write the proportion equation
   13,191.72 : 19,789.53 = 3,831.81 : x
2. Step 2: Convert to fraction form
   13,191.72/19,789.53 = 3,831.81/x
3. Step 3: Cross multiply
   13,191.72x = 19,789.53 × 3,831.81
4. Step 4: Simplify right side
   13,191.72x = 75,829,718.95
5. Step 5: Solve for x
   x = 75,829,718.95/13,191.72
6. Step 6: Final answer
   x = 5,748.28