Finding the Fourth Proportional to 2,074.21, 3,111.32 and 613.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.21 : 3,111.32 = 613.25 : x
2. Step 2: Convert to fraction form
   2,074.21/3,111.32 = 613.25/x
3. Step 3: Cross multiply
   2,074.21x = 3,111.32 × 613.25
4. Step 4: Simplify right side
   2,074.21x = 1,908,017.02
5. Step 5: Solve for x
   x = 1,908,017.02/2,074.21
6. Step 6: Final answer
   x = 919.88