Finding the Fourth Proportional to 2,073.69, 3,110.55 and 612.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.69 : 3,110.55 = 612.87 : x
2. Step 2: Convert to fraction form
   2,073.69/3,110.55 = 612.87/x
3. Step 3: Cross multiply
   2,073.69x = 3,110.55 × 612.87
4. Step 4: Simplify right side
   2,073.69x = 1,906,362.78
5. Step 5: Solve for x
   x = 1,906,362.78/2,073.69
6. Step 6: Final answer
   x = 919.31