Finding the Fourth Proportional to 2,140.82, 2,954.31 and 1,355.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.82 : 2,954.31 = 1,355.51 : x
2. Step 2: Convert to fraction form
   2,140.82/2,954.31 = 1,355.51/x
3. Step 3: Cross multiply
   2,140.82x = 2,954.31 × 1,355.51
4. Step 4: Simplify right side
   2,140.82x = 4,004,596.75
5. Step 5: Solve for x
   x = 4,004,596.75/2,140.82
6. Step 6: Final answer
   x = 1,870.59