Finding the Fourth Proportional to 2,085.10, 3,128.10 and 624.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.10 : 3,128.10 = 624.40 : x
2. Step 2: Convert to fraction form
   2,085.10/3,128.10 = 624.40/x
3. Step 3: Cross multiply
   2,085.10x = 3,128.10 × 624.40
4. Step 4: Simplify right side
   2,085.10x = 1,953,185.64
5. Step 5: Solve for x
   x = 1,953,185.64/2,085.10
6. Step 6: Final answer
   x = 936.73