Finding the Fourth Proportional to 2,785.12, 4,176.72 and 836.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,785.12 : 4,176.72 = 836.80 : x
2. Step 2: Convert to fraction form
   2,785.12/4,176.72 = 836.80/x
3. Step 3: Cross multiply
   2,785.12x = 4,176.72 × 836.80
4. Step 4: Simplify right side
   2,785.12x = 3,495,079.30
5. Step 5: Solve for x
   x = 3,495,079.30/2,785.12
6. Step 6: Final answer
   x = 1,254.91