Finding the Fourth Proportional to 2,116.28, 3,173.15 and 945.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.28 : 3,173.15 = 945.65 : x
2. Step 2: Convert to fraction form
   2,116.28/3,173.15 = 945.65/x
3. Step 3: Cross multiply
   2,116.28x = 3,173.15 × 945.65
4. Step 4: Simplify right side
   2,116.28x = 3,000,699.59
5. Step 5: Solve for x
   x = 3,000,699.59/2,116.28
6. Step 6: Final answer
   x = 1,417.91