Finding the Fourth Proportional to 1,351.68, 1,855.68 and 1,219.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.68 : 1,855.68 = 1,219.92 : x
2. Step 2: Convert to fraction form
   1,351.68/1,855.68 = 1,219.92/x
3. Step 3: Cross multiply
   1,351.68x = 1,855.68 × 1,219.92
4. Step 4: Simplify right side
   1,351.68x = 2,263,781.15
5. Step 5: Solve for x
   x = 2,263,781.15/1,351.68
6. Step 6: Final answer
   x = 1,674.79