Finding the Fourth Proportional to 2,073.25, 3,109.47 and 612.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.25 : 3,109.47 = 612.15 : x
2. Step 2: Convert to fraction form
   2,073.25/3,109.47 = 612.15/x
3. Step 3: Cross multiply
   2,073.25x = 3,109.47 × 612.15
4. Step 4: Simplify right side
   2,073.25x = 1,903,462.06
5. Step 5: Solve for x
   x = 1,903,462.06/2,073.25
6. Step 6: Final answer
   x = 918.11