Finding the Fourth Proportional to 1,377.16, 1,900.02 and 787.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.16 : 1,900.02 = 787.28 : x
2. Step 2: Convert to fraction form
   1,377.16/1,900.02 = 787.28/x
3. Step 3: Cross multiply
   1,377.16x = 1,900.02 × 787.28
4. Step 4: Simplify right side
   1,377.16x = 1,495,847.75
5. Step 5: Solve for x
   x = 1,495,847.75/1,377.16
6. Step 6: Final answer
   x = 1,086.18