Finding the Fourth Proportional to 12,999.20, 19,503.32 and 4,234.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,999.20 : 19,503.32 = 4,234.05 : x
2. Step 2: Convert to fraction form
   12,999.20/19,503.32 = 4,234.05/x
3. Step 3: Cross multiply
   12,999.20x = 19,503.32 × 4,234.05
4. Step 4: Simplify right side
   12,999.20x = 82,578,010.88
5. Step 5: Solve for x
   x = 82,578,010.88/12,999.20
6. Step 6: Final answer
   x = 6,352.55