Finding the Fourth Proportional to 2,231.37, 3,345.89 and 770.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.37 : 3,345.89 = 770.18 : x
2. Step 2: Convert to fraction form
   2,231.37/3,345.89 = 770.18/x
3. Step 3: Cross multiply
   2,231.37x = 3,345.89 × 770.18
4. Step 4: Simplify right side
   2,231.37x = 2,576,916.98
5. Step 5: Solve for x
   x = 2,576,916.98/2,231.37
6. Step 6: Final answer
   x = 1,154.86