Finding the Fourth Proportional to 2,091.39, 2,889.39 and 1,779.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.39 : 2,889.39 = 1,779.99 : x
2. Step 2: Convert to fraction form
   2,091.39/2,889.39 = 1,779.99/x
3. Step 3: Cross multiply
   2,091.39x = 2,889.39 × 1,779.99
4. Step 4: Simplify right side
   2,091.39x = 5,143,085.31
5. Step 5: Solve for x
   x = 5,143,085.31/2,091.39
6. Step 6: Final answer
   x = 2,459.17