Finding the Fourth Proportional to 2,759.86, 4,139.43 and 1,220.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,759.86 : 4,139.43 = 1,220.50 : x
2. Step 2: Convert to fraction form
   2,759.86/4,139.43 = 1,220.50/x
3. Step 3: Cross multiply
   2,759.86x = 4,139.43 × 1,220.50
4. Step 4: Simplify right side
   2,759.86x = 5,052,174.32
5. Step 5: Solve for x
   x = 5,052,174.32/2,759.86
6. Step 6: Final answer
   x = 1,830.59