Finding the Fourth Proportional to 13,656.09, 18,842.72 and 7,688.01

Step by Step Solution

1. Step 1: Write the proportion equation
   13,656.09 : 18,842.72 = 7,688.01 : x
2. Step 2: Convert to fraction form
   13,656.09/18,842.72 = 7,688.01/x
3. Step 3: Cross multiply
   13,656.09x = 18,842.72 × 7,688.01
4. Step 4: Simplify right side
   13,656.09x = 144,862,981.35
5. Step 5: Solve for x
   x = 144,862,981.35/13,656.09
6. Step 6: Final answer
   x = 10,607.94