Finding the Fourth Proportional to 2,085.36, 3,128.16 and 624.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.36 : 3,128.16 = 624.72 : x
2. Step 2: Convert to fraction form
   2,085.36/3,128.16 = 624.72/x
3. Step 3: Cross multiply
   2,085.36x = 3,128.16 × 624.72
4. Step 4: Simplify right side
   2,085.36x = 1,954,224.12
5. Step 5: Solve for x
   x = 1,954,224.12/2,085.36
6. Step 6: Final answer
   x = 937.12