Finding the Fourth Proportional to 1,376.78, 1,899.98 and 787.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.78 : 1,899.98 = 787.38 : x
2. Step 2: Convert to fraction form
   1,376.78/1,899.98 = 787.38/x
3. Step 3: Cross multiply
   1,376.78x = 1,899.98 × 787.38
4. Step 4: Simplify right side
   1,376.78x = 1,496,006.25
5. Step 5: Solve for x
   x = 1,496,006.25/1,376.78
6. Step 6: Final answer
   x = 1,086.60