Finding the Fourth Proportional to 2,087.23, 3,131.50 and 918.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.23 : 3,131.50 = 918.22 : x
2. Step 2: Convert to fraction form
   2,087.23/3,131.50 = 918.22/x
3. Step 3: Cross multiply
   2,087.23x = 3,131.50 × 918.22
4. Step 4: Simplify right side
   2,087.23x = 2,875,405.93
5. Step 5: Solve for x
   x = 2,875,405.93/2,087.23
6. Step 6: Final answer
   x = 1,377.62