Finding the Fourth Proportional to 1,376.89, 1,900.07 and 787.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.89 : 1,900.07 = 787.39 : x
2. Step 2: Convert to fraction form
   1,376.89/1,900.07 = 787.39/x
3. Step 3: Cross multiply
   1,376.89x = 1,900.07 × 787.39
4. Step 4: Simplify right side
   1,376.89x = 1,496,086.62
5. Step 5: Solve for x
   x = 1,496,086.62/1,376.89
6. Step 6: Final answer
   x = 1,086.57