Finding the Fourth Proportional to 2,087.39, 3,131.40 and 770.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.39 : 3,131.40 = 770.94 : x
2. Step 2: Convert to fraction form
   2,087.39/3,131.40 = 770.94/x
3. Step 3: Cross multiply
   2,087.39x = 3,131.40 × 770.94
4. Step 4: Simplify right side
   2,087.39x = 2,414,121.52
5. Step 5: Solve for x
   x = 2,414,121.52/2,087.39
6. Step 6: Final answer
   x = 1,156.53