Finding the Fourth Proportional to 2,003.76, 2,760.48 and 1,807.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.76 : 2,760.48 = 1,807.20 : x
2. Step 2: Convert to fraction form
   2,003.76/2,760.48 = 1,807.20/x
3. Step 3: Cross multiply
   2,003.76x = 2,760.48 × 1,807.20
4. Step 4: Simplify right side
   2,003.76x = 4,988,739.46
5. Step 5: Solve for x
   x = 4,988,739.46/2,003.76
6. Step 6: Final answer
   x = 2,489.69