Finding the Fourth Proportional to 2,085.54, 3,128.49 and 787.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.54 : 3,128.49 = 787.02 : x
2. Step 2: Convert to fraction form
   2,085.54/3,128.49 = 787.02/x
3. Step 3: Cross multiply
   2,085.54x = 3,128.49 × 787.02
4. Step 4: Simplify right side
   2,085.54x = 2,462,184.20
5. Step 5: Solve for x
   x = 2,462,184.20/2,085.54
6. Step 6: Final answer
   x = 1,180.60