Finding the Fourth Proportional to 1,010.89, 1,395.39 and 617.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.89 : 1,395.39 = 617.95 : x
2. Step 2: Convert to fraction form
   1,010.89/1,395.39 = 617.95/x
3. Step 3: Cross multiply
   1,010.89x = 1,395.39 × 617.95
4. Step 4: Simplify right side
   1,010.89x = 862,281.25
5. Step 5: Solve for x
   x = 862,281.25/1,010.89
6. Step 6: Final answer
   x = 852.99