Finding the Fourth Proportional to 2,085.79, 3,129.13 and 787.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.79 : 3,129.13 = 787.25 : x
2. Step 2: Convert to fraction form
   2,085.79/3,129.13 = 787.25/x
3. Step 3: Cross multiply
   2,085.79x = 3,129.13 × 787.25
4. Step 4: Simplify right side
   2,085.79x = 2,463,407.59
5. Step 5: Solve for x
   x = 2,463,407.59/2,085.79
6. Step 6: Final answer
   x = 1,181.04