Finding the Fourth Proportional to 1,811.69, 2,499.95 and 1,439.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,811.69 : 2,499.95 = 1,439.57 : x
2. Step 2: Convert to fraction form
   1,811.69/2,499.95 = 1,439.57/x
3. Step 3: Cross multiply
   1,811.69x = 2,499.95 × 1,439.57
4. Step 4: Simplify right side
   1,811.69x = 3,598,844.12
5. Step 5: Solve for x
   x = 3,598,844.12/1,811.69
6. Step 6: Final answer
   x = 1,986.46