Finding the Fourth Proportional to 7,618.82, 11,428.56 and 2,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,618.82 : 11,428.56 = 2,688.50 : x
2. Step 2: Convert to fraction form
   7,618.82/11,428.56 = 2,688.50/x
3. Step 3: Cross multiply
   7,618.82x = 11,428.56 × 2,688.50
4. Step 4: Simplify right side
   7,618.82x = 30,725,683.56
5. Step 5: Solve for x
   x = 30,725,683.56/7,618.82
6. Step 6: Final answer
   x = 4,032.87