Finding the Fourth Proportional to 2,074.58, 3,111.48 and 613.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.58 : 3,111.48 = 613.38 : x
2. Step 2: Convert to fraction form
   2,074.58/3,111.48 = 613.38/x
3. Step 3: Cross multiply
   2,074.58x = 3,111.48 × 613.38
4. Step 4: Simplify right side
   2,074.58x = 1,908,519.60
5. Step 5: Solve for x
   x = 1,908,519.60/2,074.58
6. Step 6: Final answer
   x = 919.96