Finding the Fourth Proportional to 1,003.05, 1,384.43 and 610.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.05 : 1,384.43 = 610.20 : x
2. Step 2: Convert to fraction form
   1,003.05/1,384.43 = 610.20/x
3. Step 3: Cross multiply
   1,003.05x = 1,384.43 × 610.20
4. Step 4: Simplify right side
   1,003.05x = 844,776.14
5. Step 5: Solve for x
   x = 844,776.14/1,003.05
6. Step 6: Final answer
   x = 842.21