Finding the Fourth Proportional to 2,073.18, 3,109.86 and 612.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.18 : 3,109.86 = 612.42 : x
2. Step 2: Convert to fraction form
   2,073.18/3,109.86 = 612.42/x
3. Step 3: Cross multiply
   2,073.18x = 3,109.86 × 612.42
4. Step 4: Simplify right side
   2,073.18x = 1,904,540.46
5. Step 5: Solve for x
   x = 1,904,540.46/2,073.18
6. Step 6: Final answer
   x = 918.66