Finding the Fourth Proportional to 2,617.31, 3,611.87 and 1,555.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.31 : 3,611.87 = 1,555.81 : x
2. Step 2: Convert to fraction form
   2,617.31/3,611.87 = 1,555.81/x
3. Step 3: Cross multiply
   2,617.31x = 3,611.87 × 1,555.81
4. Step 4: Simplify right side
   2,617.31x = 5,619,383.46
5. Step 5: Solve for x
   x = 5,619,383.46/2,617.31
6. Step 6: Final answer
   x = 2,147.01