Finding the Fourth Proportional to 11,686.42, 16,128.67 and 6,651.86

Step by Step Solution

1. Step 1: Write the proportion equation
   11,686.42 : 16,128.67 = 6,651.86 : x
2. Step 2: Convert to fraction form
   11,686.42/16,128.67 = 6,651.86/x
3. Step 3: Cross multiply
   11,686.42x = 16,128.67 × 6,651.86
4. Step 4: Simplify right side
   11,686.42x = 107,285,654.83
5. Step 5: Solve for x
   x = 107,285,654.83/11,686.42
6. Step 6: Final answer
   x = 9,180.37