Finding the Fourth Proportional to 2,645.55, 3,969.54 and 2,601.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.55 : 3,969.54 = 2,601.81 : x
2. Step 2: Convert to fraction form
   2,645.55/3,969.54 = 2,601.81/x
3. Step 3: Cross multiply
   2,645.55x = 3,969.54 × 2,601.81
4. Step 4: Simplify right side
   2,645.55x = 10,327,988.87
5. Step 5: Solve for x
   x = 10,327,988.87/2,645.55
6. Step 6: Final answer
   x = 3,903.91