Finding the Fourth Proportional to 1,816.85, 2,499.38 and 1,591.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,816.85 : 2,499.38 = 1,591.77 : x
2. Step 2: Convert to fraction form
   1,816.85/2,499.38 = 1,591.77/x
3. Step 3: Cross multiply
   1,816.85x = 2,499.38 × 1,591.77
4. Step 4: Simplify right side
   1,816.85x = 3,978,417.65
5. Step 5: Solve for x
   x = 3,978,417.65/1,816.85
6. Step 6: Final answer
   x = 2,189.74