Finding the Fourth Proportional to 2,171.58, 3,256.69 and 784.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.58 : 3,256.69 = 784.74 : x
2. Step 2: Convert to fraction form
   2,171.58/3,256.69 = 784.74/x
3. Step 3: Cross multiply
   2,171.58x = 3,256.69 × 784.74
4. Step 4: Simplify right side
   2,171.58x = 2,555,640.74
5. Step 5: Solve for x
   x = 2,555,640.74/2,171.58
6. Step 6: Final answer
   x = 1,176.86