Finding the Fourth Proportional to 2,085.59, 3,128.39 and 624.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.59 : 3,128.39 = 624.70 : x
2. Step 2: Convert to fraction form
   2,085.59/3,128.39 = 624.70/x
3. Step 3: Cross multiply
   2,085.59x = 3,128.39 × 624.70
4. Step 4: Simplify right side
   2,085.59x = 1,954,305.23
5. Step 5: Solve for x
   x = 1,954,305.23/2,085.59
6. Step 6: Final answer
   x = 937.05