Finding the Fourth Proportional to 1,403.27, 2,105.78 and 787.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.27 : 2,105.78 = 787.37 : x
2. Step 2: Convert to fraction form
   1,403.27/2,105.78 = 787.37/x
3. Step 3: Cross multiply
   1,403.27x = 2,105.78 × 787.37
4. Step 4: Simplify right side
   1,403.27x = 1,658,013.53
5. Step 5: Solve for x
   x = 1,658,013.53/1,403.27
6. Step 6: Final answer
   x = 1,181.54