Finding the Fourth Proportional to 2,074.61, 3,112.52 and 613.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.61 : 3,112.52 = 613.79 : x
2. Step 2: Convert to fraction form
   2,074.61/3,112.52 = 613.79/x
3. Step 3: Cross multiply
   2,074.61x = 3,112.52 × 613.79
4. Step 4: Simplify right side
   2,074.61x = 1,910,444.20
5. Step 5: Solve for x
   x = 1,910,444.20/2,074.61
6. Step 6: Final answer
   x = 920.87