Finding the Fourth Proportional to 2,086.35, 3,128.50 and 787.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.35 : 3,128.50 = 787.92 : x
2. Step 2: Convert to fraction form
   2,086.35/3,128.50 = 787.92/x
3. Step 3: Cross multiply
   2,086.35x = 3,128.50 × 787.92
4. Step 4: Simplify right side
   2,086.35x = 2,465,007.72
5. Step 5: Solve for x
   x = 2,465,007.72/2,086.35
6. Step 6: Final answer
   x = 1,181.49