Finding the Fourth Proportional to 2,591.13, 3,901.94 and 1,865.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.13 : 3,901.94 = 1,865.79 : x
2. Step 2: Convert to fraction form
   2,591.13/3,901.94 = 1,865.79/x
3. Step 3: Cross multiply
   2,591.13x = 3,901.94 × 1,865.79
4. Step 4: Simplify right side
   2,591.13x = 7,280,191.30
5. Step 5: Solve for x
   x = 7,280,191.30/2,591.13
6. Step 6: Final answer
   x = 2,809.66