Finding the Fourth Proportional to 2,003.78, 3,005.48 and 1,421.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.78 : 3,005.48 = 1,421.28 : x
2. Step 2: Convert to fraction form
   2,003.78/3,005.48 = 1,421.28/x
3. Step 3: Cross multiply
   2,003.78x = 3,005.48 × 1,421.28
4. Step 4: Simplify right side
   2,003.78x = 4,271,621.51
5. Step 5: Solve for x
   x = 4,271,621.51/2,003.78
6. Step 6: Final answer
   x = 2,131.79