Finding the Fourth Proportional to 2,074.48, 3,111.30 and 613.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,074.48 : 3,111.30 = 613.50 : x
2. Step 2: Convert to fraction form
   2,074.48/3,111.30 = 613.50/x
3. Step 3: Cross multiply
   2,074.48x = 3,111.30 × 613.50
4. Step 4: Simplify right side
   2,074.48x = 1,908,782.55
5. Step 5: Solve for x
   x = 1,908,782.55/2,074.48
6. Step 6: Final answer
   x = 920.13