Finding the Fourth Proportional to 2,788.42, 4,181.57 and 913.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,788.42 : 4,181.57 = 913.87 : x
2. Step 2: Convert to fraction form
   2,788.42/4,181.57 = 913.87/x
3. Step 3: Cross multiply
   2,788.42x = 4,181.57 × 913.87
4. Step 4: Simplify right side
   2,788.42x = 3,821,411.38
5. Step 5: Solve for x
   x = 3,821,411.38/2,788.42
6. Step 6: Final answer
   x = 1,370.46