Finding the Fourth Proportional to 1,015.56, 1,401.48 and 617.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.56 : 1,401.48 = 617.58 : x
2. Step 2: Convert to fraction form
   1,015.56/1,401.48 = 617.58/x
3. Step 3: Cross multiply
   1,015.56x = 1,401.48 × 617.58
4. Step 4: Simplify right side
   1,015.56x = 865,526.02
5. Step 5: Solve for x
   x = 865,526.02/1,015.56
6. Step 6: Final answer
   x = 852.26