Finding the Fourth Proportional to 2,142.40, 2,956.03 and 1,355.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.40 : 2,956.03 = 1,355.99 : x
2. Step 2: Convert to fraction form
   2,142.40/2,956.03 = 1,355.99/x
3. Step 3: Cross multiply
   2,142.40x = 2,956.03 × 1,355.99
4. Step 4: Simplify right side
   2,142.40x = 4,008,325.56
5. Step 5: Solve for x
   x = 4,008,325.56/2,142.40
6. Step 6: Final answer
   x = 1,870.96