Finding the Fourth Proportional to 1,377.02, 1,900.20 and 787.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.02 : 1,900.20 = 787.58 : x
2. Step 2: Convert to fraction form
   1,377.02/1,900.20 = 787.58/x
3. Step 3: Cross multiply
   1,377.02x = 1,900.20 × 787.58
4. Step 4: Simplify right side
   1,377.02x = 1,496,559.52
5. Step 5: Solve for x
   x = 1,496,559.52/1,377.02
6. Step 6: Final answer
   x = 1,086.81