Finding the Fourth Proportional to 2,506.28, 3,458.36 and 1,387.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,506.28 : 3,458.36 = 1,387.05 : x
2. Step 2: Convert to fraction form
   2,506.28/3,458.36 = 1,387.05/x
3. Step 3: Cross multiply
   2,506.28x = 3,458.36 × 1,387.05
4. Step 4: Simplify right side
   2,506.28x = 4,796,911.30
5. Step 5: Solve for x
   x = 4,796,911.30/2,506.28
6. Step 6: Final answer
   x = 1,913.96