Finding the Fourth Proportional to 2,779.89, 3,839.34 and 2,157.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,779.89 : 3,839.34 = 2,157.94 : x
2. Step 2: Convert to fraction form
   2,779.89/3,839.34 = 2,157.94/x
3. Step 3: Cross multiply
   2,779.89x = 3,839.34 × 2,157.94
4. Step 4: Simplify right side
   2,779.89x = 8,285,065.36
5. Step 5: Solve for x
   x = 8,285,065.36/2,779.89
6. Step 6: Final answer
   x = 2,980.36