Finding the Fourth Proportional to 12,999.11, 19,500.71 and 4,231.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,999.11 : 19,500.71 = 4,231.98 : x
2. Step 2: Convert to fraction form
   12,999.11/19,500.71 = 4,231.98/x
3. Step 3: Cross multiply
   12,999.11x = 19,500.71 × 4,231.98
4. Step 4: Simplify right side
   12,999.11x = 82,526,593.55
5. Step 5: Solve for x
   x = 82,526,593.55/12,999.11
6. Step 6: Final answer
   x = 6,348.64