Finding the Fourth Proportional to 2,086.84, 3,128.34 and 787.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.84 : 3,128.34 = 787.32 : x
2. Step 2: Convert to fraction form
   2,086.84/3,128.34 = 787.32/x
3. Step 3: Cross multiply
   2,086.84x = 3,128.34 × 787.32
4. Step 4: Simplify right side
   2,086.84x = 2,463,004.65
5. Step 5: Solve for x
   x = 2,463,004.65/2,086.84
6. Step 6: Final answer
   x = 1,180.26