Finding the Fourth Proportional to 2,780.42, 4,171.79 and 1,219.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,780.42 : 4,171.79 = 1,219.61 : x
2. Step 2: Convert to fraction form
   2,780.42/4,171.79 = 1,219.61/x
3. Step 3: Cross multiply
   2,780.42x = 4,171.79 × 1,219.61
4. Step 4: Simplify right side
   2,780.42x = 5,087,961.13
5. Step 5: Solve for x
   x = 5,087,961.13/2,780.42
6. Step 6: Final answer
   x = 1,829.93