Finding the Fourth Proportional to 1,229.59, 1,697.31 and 787.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,229.59 : 1,697.31 = 787.73 : x
2. Step 2: Convert to fraction form
   1,229.59/1,697.31 = 787.73/x
3. Step 3: Cross multiply
   1,229.59x = 1,697.31 × 787.73
4. Step 4: Simplify right side
   1,229.59x = 1,337,022.01
5. Step 5: Solve for x
   x = 1,337,022.01/1,229.59
6. Step 6: Final answer
   x = 1,087.37