Finding the Fourth Proportional to 2,505.56, 3,457.87 and 1,386.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.56 : 3,457.87 = 1,386.54 : x
2. Step 2: Convert to fraction form
   2,505.56/3,457.87 = 1,386.54/x
3. Step 3: Cross multiply
   2,505.56x = 3,457.87 × 1,386.54
4. Step 4: Simplify right side
   2,505.56x = 4,794,471.60
5. Step 5: Solve for x
   x = 4,794,471.60/2,505.56
6. Step 6: Final answer
   x = 1,913.54