Finding the Fourth Proportional to 2,140.72, 2,955.05 and 1,395.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.72 : 2,955.05 = 1,395.31 : x
2. Step 2: Convert to fraction form
   2,140.72/2,955.05 = 1,395.31/x
3. Step 3: Cross multiply
   2,140.72x = 2,955.05 × 1,395.31
4. Step 4: Simplify right side
   2,140.72x = 4,123,210.82
5. Step 5: Solve for x
   x = 4,123,210.82/2,140.72
6. Step 6: Final answer
   x = 1,926.09