Finding the Fourth Proportional to 2,758.86, 4,137.48 and 811.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,758.86 : 4,137.48 = 811.62 : x
2. Step 2: Convert to fraction form
   2,758.86/4,137.48 = 811.62/x
3. Step 3: Cross multiply
   2,758.86x = 4,137.48 × 811.62
4. Step 4: Simplify right side
   2,758.86x = 3,358,061.52
5. Step 5: Solve for x
   x = 3,358,061.52/2,758.86
6. Step 6: Final answer
   x = 1,217.19