Finding the Fourth Proportional to 2,073.86, 3,109.72 and 612.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.86 : 3,109.72 = 612.82 : x
2. Step 2: Convert to fraction form
   2,073.86/3,109.72 = 612.82/x
3. Step 3: Cross multiply
   2,073.86x = 3,109.72 × 612.82
4. Step 4: Simplify right side
   2,073.86x = 1,905,698.61
5. Step 5: Solve for x
   x = 1,905,698.61/2,073.86
6. Step 6: Final answer
   x = 918.91