Finding the Fourth Proportional to 12,999.18, 19,499.31 and 4,234.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,999.18 : 19,499.31 = 4,234.17 : x
2. Step 2: Convert to fraction form
   12,999.18/19,499.31 = 4,234.17/x
3. Step 3: Cross multiply
   12,999.18x = 19,499.31 × 4,234.17
4. Step 4: Simplify right side
   12,999.18x = 82,563,393.42
5. Step 5: Solve for x
   x = 82,563,393.42/12,999.18
6. Step 6: Final answer
   x = 6,351.43