Finding the Fourth Proportional to 2,171.85, 3,258.99 and 786.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.85 : 3,258.99 = 786.34 : x
2. Step 2: Convert to fraction form
   2,171.85/3,258.99 = 786.34/x
3. Step 3: Cross multiply
   2,171.85x = 3,258.99 × 786.34
4. Step 4: Simplify right side
   2,171.85x = 2,562,678.27
5. Step 5: Solve for x
   x = 2,562,678.27/2,171.85
6. Step 6: Final answer
   x = 1,179.95