Finding the Fourth Proportional to 2,073.80, 3,111.15 and 613.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.80 : 3,111.15 = 613.07 : x
2. Step 2: Convert to fraction form
   2,073.80/3,111.15 = 613.07/x
3. Step 3: Cross multiply
   2,073.80x = 3,111.15 × 613.07
4. Step 4: Simplify right side
   2,073.80x = 1,907,343.42
5. Step 5: Solve for x
   x = 1,907,343.42/2,073.80
6. Step 6: Final answer
   x = 919.73