Finding the Fourth Proportional to 2,613.18, 3,919.35 and 763.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.18 : 3,919.35 = 763.86 : x
2. Step 2: Convert to fraction form
   2,613.18/3,919.35 = 763.86/x
3. Step 3: Cross multiply
   2,613.18x = 3,919.35 × 763.86
4. Step 4: Simplify right side
   2,613.18x = 2,993,834.69
5. Step 5: Solve for x
   x = 2,993,834.69/2,613.18
6. Step 6: Final answer
   x = 1,145.67