Finding the Fourth Proportional to 2,003.90, 3,005.79 and 617.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.90 : 3,005.79 = 617.18 : x
2. Step 2: Convert to fraction form
   2,003.90/3,005.79 = 617.18/x
3. Step 3: Cross multiply
   2,003.90x = 3,005.79 × 617.18
4. Step 4: Simplify right side
   2,003.90x = 1,855,113.47
5. Step 5: Solve for x
   x = 1,855,113.47/2,003.90
6. Step 6: Final answer
   x = 925.75