Finding the Fourth Proportional to 8,653.50, 12,980.30 and 3,106.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,653.50 : 12,980.30 = 3,106.89 : x
2. Step 2: Convert to fraction form
   8,653.50/12,980.30 = 3,106.89/x
3. Step 3: Cross multiply
   8,653.50x = 12,980.30 × 3,106.89
4. Step 4: Simplify right side
   8,653.50x = 40,328,338.83
5. Step 5: Solve for x
   x = 40,328,338.83/8,653.50
6. Step 6: Final answer
   x = 4,660.35