Finding the Fourth Proportional to 12,766.86, 19,152.72 and 3,999.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,766.86 : 19,152.72 = 3,999.42 : x
2. Step 2: Convert to fraction form
   12,766.86/19,152.72 = 3,999.42/x
3. Step 3: Cross multiply
   12,766.86x = 19,152.72 × 3,999.42
4. Step 4: Simplify right side
   12,766.86x = 76,599,771.42
5. Step 5: Solve for x
   x = 76,599,771.42/12,766.86
6. Step 6: Final answer
   x = 5,999.89