Finding the Fourth Proportional to 2,286.47, 3,431.56 and 1,191.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.47 : 3,431.56 = 1,191.15 : x
2. Step 2: Convert to fraction form
   2,286.47/3,431.56 = 1,191.15/x
3. Step 3: Cross multiply
   2,286.47x = 3,431.56 × 1,191.15
4. Step 4: Simplify right side
   2,286.47x = 4,087,502.69
5. Step 5: Solve for x
   x = 4,087,502.69/2,286.47
6. Step 6: Final answer
   x = 1,787.69