Finding the Fourth Proportional to 2,782.32, 4,173.42 and 1,320.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,782.32 : 4,173.42 = 1,320.42 : x
2. Step 2: Convert to fraction form
   2,782.32/4,173.42 = 1,320.42/x
3. Step 3: Cross multiply
   2,782.32x = 4,173.42 × 1,320.42
4. Step 4: Simplify right side
   2,782.32x = 5,510,667.24
5. Step 5: Solve for x
   x = 5,510,667.24/2,782.32
6. Step 6: Final answer
   x = 1,980.60