Finding the Fourth Proportional to 2,072.49, 3,109.03 and 611.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.49 : 3,109.03 = 611.96 : x
2. Step 2: Convert to fraction form
   2,072.49/3,109.03 = 611.96/x
3. Step 3: Cross multiply
   2,072.49x = 3,109.03 × 611.96
4. Step 4: Simplify right side
   2,072.49x = 1,902,588.37
5. Step 5: Solve for x
   x = 1,902,588.37/2,072.49
6. Step 6: Final answer
   x = 918.02