Finding the Fourth Proportional to 13,656.96, 18,846.65 and 7,688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,656.96 : 18,846.65 = 7,688.72 : x
2. Step 2: Convert to fraction form
   13,656.96/18,846.65 = 7,688.72/x
3. Step 3: Cross multiply
   13,656.96x = 18,846.65 × 7,688.72
4. Step 4: Simplify right side
   13,656.96x = 144,906,576.34
5. Step 5: Solve for x
   x = 144,906,576.34/13,656.96
6. Step 6: Final answer
   x = 10,610.46