Finding the Fourth Proportional to 16,820.72, 23,212.68 and 9,368.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,820.72 : 23,212.68 = 9,368.72 : x
2. Step 2: Convert to fraction form
   16,820.72/23,212.68 = 9,368.72/x
3. Step 3: Cross multiply
   16,820.72x = 23,212.68 × 9,368.72
4. Step 4: Simplify right side
   16,820.72x = 217,473,099.37
5. Step 5: Solve for x
   x = 217,473,099.37/16,820.72
6. Step 6: Final answer
   x = 12,928.88