Finding the Fourth Proportional to 9,178.68, 12,667.28 and 5,199.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,178.68 : 12,667.28 = 5,199.69 : x
2. Step 2: Convert to fraction form
   9,178.68/12,667.28 = 5,199.69/x
3. Step 3: Cross multiply
   9,178.68x = 12,667.28 × 5,199.69
4. Step 4: Simplify right side
   9,178.68x = 65,865,929.14
5. Step 5: Solve for x
   x = 65,865,929.14/9,178.68
6. Step 6: Final answer
   x = 7,175.97