Finding the Fourth Proportional to 1,289.50, 1,779.69 and 792.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,289.50 : 1,779.69 = 792.18 : x
2. Step 2: Convert to fraction form
   1,289.50/1,779.69 = 792.18/x
3. Step 3: Cross multiply
   1,289.50x = 1,779.69 × 792.18
4. Step 4: Simplify right side
   1,289.50x = 1,409,834.82
5. Step 5: Solve for x
   x = 1,409,834.82/1,289.50
6. Step 6: Final answer
   x = 1,093.32