Finding the Fourth Proportional to 2,074.86, 3,112.61 and 613.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.86 : 3,112.61 = 613.85 : x
2. Step 2: Convert to fraction form
   2,074.86/3,112.61 = 613.85/x
3. Step 3: Cross multiply
   2,074.86x = 3,112.61 × 613.85
4. Step 4: Simplify right side
   2,074.86x = 1,910,657.02
5. Step 5: Solve for x
   x = 1,910,657.02/2,074.86
6. Step 6: Final answer
   x = 920.86