Finding the Fourth Proportional to 1,010.50, 1,394.59 and 612.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.50 : 1,394.59 = 612.15 : x
2. Step 2: Convert to fraction form
   1,010.50/1,394.59 = 612.15/x
3. Step 3: Cross multiply
   1,010.50x = 1,394.59 × 612.15
4. Step 4: Simplify right side
   1,010.50x = 853,701.24
5. Step 5: Solve for x
   x = 853,701.24/1,010.50
6. Step 6: Final answer
   x = 844.83