Finding the Fourth Proportional to 17,128.72, 25,688.40 and 7,267.60

Step by Step Solution

1. Step 1: Write the proportion equation
   17,128.72 : 25,688.40 = 7,267.60 : x
2. Step 2: Convert to fraction form
   17,128.72/25,688.40 = 7,267.60/x
3. Step 3: Cross multiply
   17,128.72x = 25,688.40 × 7,267.60
4. Step 4: Simplify right side
   17,128.72x = 186,693,015.84
5. Step 5: Solve for x
   x = 186,693,015.84/17,128.72
6. Step 6: Final answer
   x = 10,899.41