Finding the Fourth Proportional to 2,505.12, 3,457.01 and 1,386.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.12 : 3,457.01 = 1,386.03 : x
2. Step 2: Convert to fraction form
   2,505.12/3,457.01 = 1,386.03/x
3. Step 3: Cross multiply
   2,505.12x = 3,457.01 × 1,386.03
4. Step 4: Simplify right side
   2,505.12x = 4,791,519.57
5. Step 5: Solve for x
   x = 4,791,519.57/2,505.12
6. Step 6: Final answer
   x = 1,912.69