Finding the Fourth Proportional to 1,359.22, 1,875.75 and 769.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.22 : 1,875.75 = 769.78 : x
2. Step 2: Convert to fraction form
   1,359.22/1,875.75 = 769.78/x
3. Step 3: Cross multiply
   1,359.22x = 1,875.75 × 769.78
4. Step 4: Simplify right side
   1,359.22x = 1,443,914.84
5. Step 5: Solve for x
   x = 1,443,914.84/1,359.22
6. Step 6: Final answer
   x = 1,062.31