Finding the Fourth Proportional to 12,051.85, 16,617.39 and 9,659.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,051.85 : 16,617.39 = 9,659.91 : x
2. Step 2: Convert to fraction form
   12,051.85/16,617.39 = 9,659.91/x
3. Step 3: Cross multiply
   12,051.85x = 16,617.39 × 9,659.91
4. Step 4: Simplify right side
   12,051.85x = 160,522,491.83
5. Step 5: Solve for x
   x = 160,522,491.83/12,051.85
6. Step 6: Final answer
   x = 13,319.32