Finding the Fourth Proportional to 2,086.04, 3,128.60 and 624.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.04 : 3,128.60 = 624.80 : x
2. Step 2: Convert to fraction form
   2,086.04/3,128.60 = 624.80/x
3. Step 3: Cross multiply
   2,086.04x = 3,128.60 × 624.80
4. Step 4: Simplify right side
   2,086.04x = 1,954,749.28
5. Step 5: Solve for x
   x = 1,954,749.28/2,086.04
6. Step 6: Final answer
   x = 937.06