Finding the Fourth Proportional to 1,787.31, 2,465.78 and 1,087.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,787.31 : 2,465.78 = 1,087.47 : x
2. Step 2: Convert to fraction form
   1,787.31/2,465.78 = 1,087.47/x
3. Step 3: Cross multiply
   1,787.31x = 2,465.78 × 1,087.47
4. Step 4: Simplify right side
   1,787.31x = 2,681,456.34
5. Step 5: Solve for x
   x = 2,681,456.34/1,787.31
6. Step 6: Final answer
   x = 1,500.27