Finding the Fourth Proportional to 12,429.39, 17,152.56 and 6,840.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.39 : 17,152.56 = 6,840.39 : x
2. Step 2: Convert to fraction form
   12,429.39/17,152.56 = 6,840.39/x
3. Step 3: Cross multiply
   12,429.39x = 17,152.56 × 6,840.39
4. Step 4: Simplify right side
   12,429.39x = 117,330,199.90
5. Step 5: Solve for x
   x = 117,330,199.90/12,429.39
6. Step 6: Final answer
   x = 9,439.74