Finding the Fourth Proportional to 1,399.55, 2,108.80 and 1,161.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.55 : 2,108.80 = 1,161.41 : x
2. Step 2: Convert to fraction form
   1,399.55/2,108.80 = 1,161.41/x
3. Step 3: Cross multiply
   1,399.55x = 2,108.80 × 1,161.41
4. Step 4: Simplify right side
   1,399.55x = 2,449,172.32
5. Step 5: Solve for x
   x = 2,449,172.32/1,399.55
6. Step 6: Final answer
   x = 1,749.98