Finding the Fourth Proportional to 12,429.24, 17,151.90 and 6,840.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.24 : 17,151.90 = 6,840.12 : x
2. Step 2: Convert to fraction form
   12,429.24/17,151.90 = 6,840.12/x
3. Step 3: Cross multiply
   12,429.24x = 17,151.90 × 6,840.12
4. Step 4: Simplify right side
   12,429.24x = 117,321,054.23
5. Step 5: Solve for x
   x = 117,321,054.23/12,429.24
6. Step 6: Final answer
   x = 9,439.12