Finding the Fourth Proportional to 3,688.89, 5,091.09 and 2,196.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,688.89 : 5,091.09 = 2,196.78 : x
2. Step 2: Convert to fraction form
   3,688.89/5,091.09 = 2,196.78/x
3. Step 3: Cross multiply
   3,688.89x = 5,091.09 × 2,196.78
4. Step 4: Simplify right side
   3,688.89x = 11,184,004.69
5. Step 5: Solve for x
   x = 11,184,004.69/3,688.89
6. Step 6: Final answer
   x = 3,031.81