Finding the Fourth Proportional to 2,987.55, 4,123.31 and 1,809.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.55 : 4,123.31 = 1,809.20 : x
2. Step 2: Convert to fraction form
   2,987.55/4,123.31 = 1,809.20/x
3. Step 3: Cross multiply
   2,987.55x = 4,123.31 × 1,809.20
4. Step 4: Simplify right side
   2,987.55x = 7,459,893.71
5. Step 5: Solve for x
   x = 7,459,893.71/2,987.55
6. Step 6: Final answer
   x = 2,496.99