Finding the Fourth Proportional to 1,359, 1,875.20 and 769.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359 : 1,875.20 = 769.55 : x
2. Step 2: Convert to fraction form
   1,359/1,875.20 = 769.55/x
3. Step 3: Cross multiply
   1,359x = 1,875.20 × 769.55
4. Step 4: Simplify right side
   1,359x = 1,443,046.94
5. Step 5: Solve for x
   x = 1,443,046.94/1,359
6. Step 6: Final answer
   x = 1,061.84