Finding the Fourth Proportional to 1,015.38, 1,401.16 and 617.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.38 : 1,401.16 = 617.12 : x
2. Step 2: Convert to fraction form
   1,015.38/1,401.16 = 617.12/x
3. Step 3: Cross multiply
   1,015.38x = 1,401.16 × 617.12
4. Step 4: Simplify right side
   1,015.38x = 864,683.86
5. Step 5: Solve for x
   x = 864,683.86/1,015.38
6. Step 6: Final answer
   x = 851.59