Finding the Fourth Proportional to 2,003.60, 2,997.30 and 1,809.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.60 : 2,997.30 = 1,809.20 : x
2. Step 2: Convert to fraction form
   2,003.60/2,997.30 = 1,809.20/x
3. Step 3: Cross multiply
   2,003.60x = 2,997.30 × 1,809.20
4. Step 4: Simplify right side
   2,003.60x = 5,422,715.16
5. Step 5: Solve for x
   x = 5,422,715.16/2,003.60
6. Step 6: Final answer
   x = 2,706.49