Finding the Fourth Proportional to 8,460.60, 12,689.42 and 3,196.07

Step by Step Solution

1. Step 1: Write the proportion equation
   8,460.60 : 12,689.42 = 3,196.07 : x
2. Step 2: Convert to fraction form
   8,460.60/12,689.42 = 3,196.07/x
3. Step 3: Cross multiply
   8,460.60x = 12,689.42 × 3,196.07
4. Step 4: Simplify right side
   8,460.60x = 40,556,290.32
5. Step 5: Solve for x
   x = 40,556,290.32/8,460.60
6. Step 6: Final answer
   x = 4,793.55