Finding the Fourth Proportional to 2,145.87, 3,215.57 and 1,374.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.87 : 3,215.57 = 1,374.75 : x
2. Step 2: Convert to fraction form
   2,145.87/3,215.57 = 1,374.75/x
3. Step 3: Cross multiply
   2,145.87x = 3,215.57 × 1,374.75
4. Step 4: Simplify right side
   2,145.87x = 4,420,597.98
5. Step 5: Solve for x
   x = 4,420,597.98/2,145.87
6. Step 6: Final answer
   x = 2,060.05