Finding the Fourth Proportional to 8,389.77, 12,586.18 and 3,456.67

Step by Step Solution

1. Step 1: Write the proportion equation
   8,389.77 : 12,586.18 = 3,456.67 : x
2. Step 2: Convert to fraction form
   8,389.77/12,586.18 = 3,456.67/x
3. Step 3: Cross multiply
   8,389.77x = 12,586.18 × 3,456.67
4. Step 4: Simplify right side
   8,389.77x = 43,506,270.82
5. Step 5: Solve for x
   x = 43,506,270.82/8,389.77
6. Step 6: Final answer
   x = 5,185.63