Finding the Fourth Proportional to 1,286.89, 1,774.57 and 1,100.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,286.89 : 1,774.57 = 1,100.99 : x
2. Step 2: Convert to fraction form
   1,286.89/1,774.57 = 1,100.99/x
3. Step 3: Cross multiply
   1,286.89x = 1,774.57 × 1,100.99
4. Step 4: Simplify right side
   1,286.89x = 1,953,787.57
5. Step 5: Solve for x
   x = 1,953,787.57/1,286.89
6. Step 6: Final answer
   x = 1,518.23