Finding the Fourth Proportional to 2,679.35, 3,992.72 and 2,591.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,679.35 : 3,992.72 = 2,591.25 : x
2. Step 2: Convert to fraction form
   2,679.35/3,992.72 = 2,591.25/x
3. Step 3: Cross multiply
   2,679.35x = 3,992.72 × 2,591.25
4. Step 4: Simplify right side
   2,679.35x = 10,346,122.74
5. Step 5: Solve for x
   x = 10,346,122.74/2,679.35
6. Step 6: Final answer
   x = 3,861.44