Finding the Fourth Proportional to 1,809.59, 2,490.91 and 1,576.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,809.59 : 2,490.91 = 1,576.31 : x
2. Step 2: Convert to fraction form
   1,809.59/2,490.91 = 1,576.31/x
3. Step 3: Cross multiply
   1,809.59x = 2,490.91 × 1,576.31
4. Step 4: Simplify right side
   1,809.59x = 3,926,429.95
5. Step 5: Solve for x
   x = 3,926,429.95/1,809.59
6. Step 6: Final answer
   x = 2,169.80