Finding the Fourth Proportional to 1,290.50, 1,780.96 and 793.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.50 : 1,780.96 = 793.67 : x
2. Step 2: Convert to fraction form
   1,290.50/1,780.96 = 793.67/x
3. Step 3: Cross multiply
   1,290.50x = 1,780.96 × 793.67
4. Step 4: Simplify right side
   1,290.50x = 1,413,494.52
5. Step 5: Solve for x
   x = 1,413,494.52/1,290.50
6. Step 6: Final answer
   x = 1,095.31