Finding the Fourth Proportional to 12,667.16, 18,998.52 and 3,431

Step by Step Solution

1. Step 1: Write the proportion equation
   12,667.16 : 18,998.52 = 3,431 : x
2. Step 2: Convert to fraction form
   12,667.16/18,998.52 = 3,431/x
3. Step 3: Cross multiply
   12,667.16x = 18,998.52 × 3,431
4. Step 4: Simplify right side
   12,667.16x = 65,183,922.12
5. Step 5: Solve for x
   x = 65,183,922.12/12,667.16
6. Step 6: Final answer
   x = 5,145.90