Finding the Fourth Proportional to 2,505.56, 3,457.61 and 1,386.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.56 : 3,457.61 = 1,386.47 : x
2. Step 2: Convert to fraction form
   2,505.56/3,457.61 = 1,386.47/x
3. Step 3: Cross multiply
   2,505.56x = 3,457.61 × 1,386.47
4. Step 4: Simplify right side
   2,505.56x = 4,793,863.90
5. Step 5: Solve for x
   x = 4,793,863.90/2,505.56
6. Step 6: Final answer
   x = 1,913.29