Finding the Fourth Proportional to 15,820.55, 21,831.48 and 8,746.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,820.55 : 21,831.48 = 8,746.50 : x
2. Step 2: Convert to fraction form
   15,820.55/21,831.48 = 8,746.50/x
3. Step 3: Cross multiply
   15,820.55x = 21,831.48 × 8,746.50
4. Step 4: Simplify right side
   15,820.55x = 190,949,039.82
5. Step 5: Solve for x
   x = 190,949,039.82/15,820.55
6. Step 6: Final answer
   x = 12,069.69