Finding the Fourth Proportional to 2,074.05, 3,111.28 and 613.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.05 : 3,111.28 = 613.62 : x
2. Step 2: Convert to fraction form
   2,074.05/3,111.28 = 613.62/x
3. Step 3: Cross multiply
   2,074.05x = 3,111.28 × 613.62
4. Step 4: Simplify right side
   2,074.05x = 1,909,143.63
5. Step 5: Solve for x
   x = 1,909,143.63/2,074.05
6. Step 6: Final answer
   x = 920.49