Finding the Fourth Proportional to 2,074.70, 3,112.06 and 613.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.70 : 3,112.06 = 613.86 : x
2. Step 2: Convert to fraction form
   2,074.70/3,112.06 = 613.86/x
3. Step 3: Cross multiply
   2,074.70x = 3,112.06 × 613.86
4. Step 4: Simplify right side
   2,074.70x = 1,910,369.15
5. Step 5: Solve for x
   x = 1,910,369.15/2,074.70
6. Step 6: Final answer
   x = 920.79