Finding the Fourth Proportional to 2,505.30, 3,457.05 and 1,386.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.30 : 3,457.05 = 1,386.06 : x
2. Step 2: Convert to fraction form
   2,505.30/3,457.05 = 1,386.06/x
3. Step 3: Cross multiply
   2,505.30x = 3,457.05 × 1,386.06
4. Step 4: Simplify right side
   2,505.30x = 4,791,678.72
5. Step 5: Solve for x
   x = 4,791,678.72/2,505.30
6. Step 6: Final answer
   x = 1,912.62