Finding the Fourth Proportional to 1,359.28, 1,875.96 and 769.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.28 : 1,875.96 = 769.70 : x
2. Step 2: Convert to fraction form
   1,359.28/1,875.96 = 769.70/x
3. Step 3: Cross multiply
   1,359.28x = 1,875.96 × 769.70
4. Step 4: Simplify right side
   1,359.28x = 1,443,931.10
5. Step 5: Solve for x
   x = 1,443,931.10/1,359.28
6. Step 6: Final answer
   x = 1,062.28