Finding the Fourth Proportional to 12,667.16, 18,990.49 and 5,277.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,667.16 : 18,990.49 = 5,277.17 : x
2. Step 2: Convert to fraction form
   12,667.16/18,990.49 = 5,277.17/x
3. Step 3: Cross multiply
   12,667.16x = 18,990.49 × 5,277.17
4. Step 4: Simplify right side
   12,667.16x = 100,215,983.44
5. Step 5: Solve for x
   x = 100,215,983.44/12,667.16
6. Step 6: Final answer
   x = 7,911.48