Finding the Fourth Proportional to 1,359.20, 1,875.69 and 769.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.20 : 1,875.69 = 769.71 : x
2. Step 2: Convert to fraction form
   1,359.20/1,875.69 = 769.71/x
3. Step 3: Cross multiply
   1,359.20x = 1,875.69 × 769.71
4. Step 4: Simplify right side
   1,359.20x = 1,443,737.35
5. Step 5: Solve for x
   x = 1,443,737.35/1,359.20
6. Step 6: Final answer
   x = 1,062.20