Finding the Fourth Proportional to 1,318.55, 1,819.59 and 787.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,318.55 : 1,819.59 = 787.67 : x
2. Step 2: Convert to fraction form
   1,318.55/1,819.59 = 787.67/x
3. Step 3: Cross multiply
   1,318.55x = 1,819.59 × 787.67
4. Step 4: Simplify right side
   1,318.55x = 1,433,245.89
5. Step 5: Solve for x
   x = 1,433,245.89/1,318.55
6. Step 6: Final answer
   x = 1,086.99