Finding the Fourth Proportional to 2,171.75, 2,996.30 and 1,386.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.75 : 2,996.30 = 1,386.05 : x
2. Step 2: Convert to fraction form
   2,171.75/2,996.30 = 1,386.05/x
3. Step 3: Cross multiply
   2,171.75x = 2,996.30 × 1,386.05
4. Step 4: Simplify right side
   2,171.75x = 4,153,010.10
5. Step 5: Solve for x
   x = 4,153,010.10/2,171.75
6. Step 6: Final answer
   x = 1,912.29