Finding the Fourth Proportional to 11,428.30, 17,134.16 and 7,721.34

Step by Step Solution

1. Step 1: Write the proportion equation
   11,428.30 : 17,134.16 = 7,721.34 : x
2. Step 2: Convert to fraction form
   11,428.30/17,134.16 = 7,721.34/x
3. Step 3: Cross multiply
   11,428.30x = 17,134.16 × 7,721.34
4. Step 4: Simplify right side
   11,428.30x = 132,298,674.97
5. Step 5: Solve for x
   x = 132,298,674.97/11,428.30
6. Step 6: Final answer
   x = 11,576.41