Finding the Fourth Proportional to 1,346.71, 1,858.78 and 787.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,346.71 : 1,858.78 = 787.44 : x
2. Step 2: Convert to fraction form
   1,346.71/1,858.78 = 787.44/x
3. Step 3: Cross multiply
   1,346.71x = 1,858.78 × 787.44
4. Step 4: Simplify right side
   1,346.71x = 1,463,677.72
5. Step 5: Solve for x
   x = 1,463,677.72/1,346.71
6. Step 6: Final answer
   x = 1,086.85