Finding the Fourth Proportional to 15,820.74, 21,831.81 and 8,746.71

Step by Step Solution

1. Step 1: Write the proportion equation
   15,820.74 : 21,831.81 = 8,746.71 : x
2. Step 2: Convert to fraction form
   15,820.74/21,831.81 = 8,746.71/x
3. Step 3: Cross multiply
   15,820.74x = 21,831.81 × 8,746.71
4. Step 4: Simplify right side
   15,820.74x = 190,956,510.85
5. Step 5: Solve for x
   x = 190,956,510.85/15,820.74
6. Step 6: Final answer
   x = 12,070.01