Finding the Fourth Proportional to 2,072.58, 3,109.95 and 918.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.58 : 3,109.95 = 918.06 : x
2. Step 2: Convert to fraction form
   2,072.58/3,109.95 = 918.06/x
3. Step 3: Cross multiply
   2,072.58x = 3,109.95 × 918.06
4. Step 4: Simplify right side
   2,072.58x = 2,855,131.91
5. Step 5: Solve for x
   x = 2,855,131.91/2,072.58
6. Step 6: Final answer
   x = 1,377.57