Finding the Fourth Proportional to 12,986.25, 17,906.69 and 9,394.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.25 : 17,906.69 = 9,394.10 : x
2. Step 2: Convert to fraction form
   12,986.25/17,906.69 = 9,394.10/x
3. Step 3: Cross multiply
   12,986.25x = 17,906.69 × 9,394.10
4. Step 4: Simplify right side
   12,986.25x = 168,217,100.03
5. Step 5: Solve for x
   x = 168,217,100.03/12,986.25
6. Step 6: Final answer
   x = 12,953.48