Finding the Fourth Proportional to 1,417.38, 1,955.76 and 787.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.38 : 1,955.76 = 787.80 : x
2. Step 2: Convert to fraction form
   1,417.38/1,955.76 = 787.80/x
3. Step 3: Cross multiply
   1,417.38x = 1,955.76 × 787.80
4. Step 4: Simplify right side
   1,417.38x = 1,540,747.73
5. Step 5: Solve for x
   x = 1,540,747.73/1,417.38
6. Step 6: Final answer
   x = 1,087.04