Finding the Fourth Proportional to 1,359.36, 1,875.72 and 769.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.36 : 1,875.72 = 769.80 : x
2. Step 2: Convert to fraction form
   1,359.36/1,875.72 = 769.80/x
3. Step 3: Cross multiply
   1,359.36x = 1,875.72 × 769.80
4. Step 4: Simplify right side
   1,359.36x = 1,443,929.26
5. Step 5: Solve for x
   x = 1,443,929.26/1,359.36
6. Step 6: Final answer
   x = 1,062.21