Finding the Fourth Proportional to 19,399.50, 29,102.76 and 12,831.12

Step by Step Solution

1. Step 1: Write the proportion equation
   19,399.50 : 29,102.76 = 12,831.12 : x
2. Step 2: Convert to fraction form
   19,399.50/29,102.76 = 12,831.12/x
3. Step 3: Cross multiply
   19,399.50x = 29,102.76 × 12,831.12
4. Step 4: Simplify right side
   19,399.50x = 373,421,005.89
5. Step 5: Solve for x
   x = 373,421,005.89/19,399.50
6. Step 6: Final answer
   x = 19,249.00