Finding the Fourth Proportional to 13,996.96, 19,315.92 and 7,709.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,996.96 : 19,315.92 = 7,709.60 : x
2. Step 2: Convert to fraction form
   13,996.96/19,315.92 = 7,709.60/x
3. Step 3: Cross multiply
   13,996.96x = 19,315.92 × 7,709.60
4. Step 4: Simplify right side
   13,996.96x = 148,918,016.83
5. Step 5: Solve for x
   x = 148,918,016.83/13,996.96
6. Step 6: Final answer
   x = 10,639.31