Finding the Fourth Proportional to 2,085.32, 3,128.70 and 787.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.32 : 3,128.70 = 787.16 : x
2. Step 2: Convert to fraction form
   2,085.32/3,128.70 = 787.16/x
3. Step 3: Cross multiply
   2,085.32x = 3,128.70 × 787.16
4. Step 4: Simplify right side
   2,085.32x = 2,462,787.49
5. Step 5: Solve for x
   x = 2,462,787.49/2,085.32
6. Step 6: Final answer
   x = 1,181.01