Finding the Fourth Proportional to 2,557.18, 3,836.58 and 913.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.18 : 3,836.58 = 913.69 : x
2. Step 2: Convert to fraction form
   2,557.18/3,836.58 = 913.69/x
3. Step 3: Cross multiply
   2,557.18x = 3,836.58 × 913.69
4. Step 4: Simplify right side
   2,557.18x = 3,505,444.78
5. Step 5: Solve for x
   x = 3,505,444.78/2,557.18
6. Step 6: Final answer
   x = 1,370.82