Finding the Fourth Proportional to 1,377.06, 1,900.43 and 787.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.06 : 1,900.43 = 787.79 : x
2. Step 2: Convert to fraction form
   1,377.06/1,900.43 = 787.79/x
3. Step 3: Cross multiply
   1,377.06x = 1,900.43 × 787.79
4. Step 4: Simplify right side
   1,377.06x = 1,497,126.31
5. Step 5: Solve for x
   x = 1,497,126.31/1,377.06
6. Step 6: Final answer
   x = 1,087.19