Finding the Fourth Proportional to 12,141.16, 16,739.94 and 9,618.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,141.16 : 16,739.94 = 9,618.28 : x
2. Step 2: Convert to fraction form
   12,141.16/16,739.94 = 9,618.28/x
3. Step 3: Cross multiply
   12,141.16x = 16,739.94 × 9,618.28
4. Step 4: Simplify right side
   12,141.16x = 161,009,430.10
5. Step 5: Solve for x
   x = 161,009,430.10/12,141.16
6. Step 6: Final answer
   x = 13,261.45