Finding the Fourth Proportional to 2,801.67, 3,864.69 and 2,591.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,801.67 : 3,864.69 = 2,591.70 : x
2. Step 2: Convert to fraction form
   2,801.67/3,864.69 = 2,591.70/x
3. Step 3: Cross multiply
   2,801.67x = 3,864.69 × 2,591.70
4. Step 4: Simplify right side
   2,801.67x = 10,016,117.07
5. Step 5: Solve for x
   x = 10,016,117.07/2,801.67
6. Step 6: Final answer
   x = 3,575.05