Finding the Fourth Proportional to 1,289.32, 1,779.59 and 765.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,289.32 : 1,779.59 = 765.25 : x
2. Step 2: Convert to fraction form
   1,289.32/1,779.59 = 765.25/x
3. Step 3: Cross multiply
   1,289.32x = 1,779.59 × 765.25
4. Step 4: Simplify right side
   1,289.32x = 1,361,831.25
5. Step 5: Solve for x
   x = 1,361,831.25/1,289.32
6. Step 6: Final answer
   x = 1,056.24