Finding the Fourth Proportional to 17,128.72, 23,636.52 and 9,677.20

Step by Step Solution

1. Step 1: Write the proportion equation
   17,128.72 : 23,636.52 = 9,677.20 : x
2. Step 2: Convert to fraction form
   17,128.72/23,636.52 = 9,677.20/x
3. Step 3: Cross multiply
   17,128.72x = 23,636.52 × 9,677.20
4. Step 4: Simplify right side
   17,128.72x = 228,735,331.34
5. Step 5: Solve for x
   x = 228,735,331.34/17,128.72
6. Step 6: Final answer
   x = 13,353.91