Finding the Fourth Proportional to 21,200.03, 31,762.62 and 12,863.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,200.03 : 31,762.62 = 12,863.12 : x
2. Step 2: Convert to fraction form
   21,200.03/31,762.62 = 12,863.12/x
3. Step 3: Cross multiply
   21,200.03x = 31,762.62 × 12,863.12
4. Step 4: Simplify right side
   21,200.03x = 408,566,233.76
5. Step 5: Solve for x
   x = 408,566,233.76/21,200.03
6. Step 6: Final answer
   x = 19,271.97