Finding the Fourth Proportional to 11,842.20, 16,344.72 and 7,129.08

Step by Step Solution

1. Step 1: Write the proportion equation
   11,842.20 : 16,344.72 = 7,129.08 : x
2. Step 2: Convert to fraction form
   11,842.20/16,344.72 = 7,129.08/x
3. Step 3: Cross multiply
   11,842.20x = 16,344.72 × 7,129.08
4. Step 4: Simplify right side
   11,842.20x = 116,522,816.46
5. Step 5: Solve for x
   x = 116,522,816.46/11,842.20
6. Step 6: Final answer
   x = 9,839.63