Finding the Fourth Proportional to 1,411.74, 2,115.60 and 787.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.74 : 2,115.60 = 787.14 : x
2. Step 2: Convert to fraction form
   1,411.74/2,115.60 = 787.14/x
3. Step 3: Cross multiply
   1,411.74x = 2,115.60 × 787.14
4. Step 4: Simplify right side
   1,411.74x = 1,665,273.38
5. Step 5: Solve for x
   x = 1,665,273.38/1,411.74
6. Step 6: Final answer
   x = 1,179.59