Finding the Fourth Proportional to 1,377.09, 1,900.40 and 787.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.09 : 1,900.40 = 787.59 : x
2. Step 2: Convert to fraction form
   1,377.09/1,900.40 = 787.59/x
3. Step 3: Cross multiply
   1,377.09x = 1,900.40 × 787.59
4. Step 4: Simplify right side
   1,377.09x = 1,496,732.10
5. Step 5: Solve for x
   x = 1,496,732.10/1,377.09
6. Step 6: Final answer
   x = 1,086.88