Finding the Fourth Proportional to 2,115.39, 2,897.89 and 2,091.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.39 : 2,897.89 = 2,091.69 : x
2. Step 2: Convert to fraction form
   2,115.39/2,897.89 = 2,091.69/x
3. Step 3: Cross multiply
   2,115.39x = 2,897.89 × 2,091.69
4. Step 4: Simplify right side
   2,115.39x = 6,061,482.30
5. Step 5: Solve for x
   x = 6,061,482.30/2,115.39
6. Step 6: Final answer
   x = 2,865.42