Finding the Fourth Proportional to 13,667.16, 20,496.42 and 4,431

Step by Step Solution

1. Step 1: Write the proportion equation
   13,667.16 : 20,496.42 = 4,431 : x
2. Step 2: Convert to fraction form
   13,667.16/20,496.42 = 4,431/x
3. Step 3: Cross multiply
   13,667.16x = 20,496.42 × 4,431
4. Step 4: Simplify right side
   13,667.16x = 90,819,637.02
5. Step 5: Solve for x
   x = 90,819,637.02/13,667.16
6. Step 6: Final answer
   x = 6,645.10