Finding the Fourth Proportional to 1,355.08, 1,869.71 and 787.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.08 : 1,869.71 = 787.83 : x
2. Step 2: Convert to fraction form
   1,355.08/1,869.71 = 787.83/x
3. Step 3: Cross multiply
   1,355.08x = 1,869.71 × 787.83
4. Step 4: Simplify right side
   1,355.08x = 1,473,010.62
5. Step 5: Solve for x
   x = 1,473,010.62/1,355.08
6. Step 6: Final answer
   x = 1,087.03