Finding the Fourth Proportional to 12,142.16, 16,741.32 and 9,619.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,142.16 : 16,741.32 = 9,619.28 : x
2. Step 2: Convert to fraction form
   12,142.16/16,741.32 = 9,619.28/x
3. Step 3: Cross multiply
   12,142.16x = 16,741.32 × 9,619.28
4. Step 4: Simplify right side
   12,142.16x = 161,039,444.65
5. Step 5: Solve for x
   x = 161,039,444.65/12,142.16
6. Step 6: Final answer
   x = 13,262.83