Finding the Fourth Proportional to 2,086.31, 3,130.01 and 787.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.31 : 3,130.01 = 787.79 : x
2. Step 2: Convert to fraction form
   2,086.31/3,130.01 = 787.79/x
3. Step 3: Cross multiply
   2,086.31x = 3,130.01 × 787.79
4. Step 4: Simplify right side
   2,086.31x = 2,465,786.64
5. Step 5: Solve for x
   x = 2,465,786.64/2,086.31
6. Step 6: Final answer
   x = 1,181.89