Finding the Fourth Proportional to 2,085.60, 3,128.31 and 624.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.60 : 3,128.31 = 624.75 : x
2. Step 2: Convert to fraction form
   2,085.60/3,128.31 = 624.75/x
3. Step 3: Cross multiply
   2,085.60x = 3,128.31 × 624.75
4. Step 4: Simplify right side
   2,085.60x = 1,954,411.67
5. Step 5: Solve for x
   x = 1,954,411.67/2,085.60
6. Step 6: Final answer
   x = 937.10