Finding the Fourth Proportional to 11,402.31, 17,109.39 and 8,628.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11,402.31 : 17,109.39 = 8,628.16 : x
2. Step 2: Convert to fraction form
   11,402.31/17,109.39 = 8,628.16/x
3. Step 3: Cross multiply
   11,402.31x = 17,109.39 × 8,628.16
4. Step 4: Simplify right side
   11,402.31x = 147,622,554.42
5. Step 5: Solve for x
   x = 147,622,554.42/11,402.31
6. Step 6: Final answer
   x = 12,946.72