Finding the Fourth Proportional to 2,003.60, 3,005.70 and 704.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.60 : 3,005.70 = 704.78 : x
2. Step 2: Convert to fraction form
   2,003.60/3,005.70 = 704.78/x
3. Step 3: Cross multiply
   2,003.60x = 3,005.70 × 704.78
4. Step 4: Simplify right side
   2,003.60x = 2,118,357.25
5. Step 5: Solve for x
   x = 2,118,357.25/2,003.60
6. Step 6: Final answer
   x = 1,057.28