Finding the Fourth Proportional to 1,359.10, 1,875.63 and 769.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.10 : 1,875.63 = 769.60 : x
2. Step 2: Convert to fraction form
   1,359.10/1,875.63 = 769.60/x
3. Step 3: Cross multiply
   1,359.10x = 1,875.63 × 769.60
4. Step 4: Simplify right side
   1,359.10x = 1,443,484.85
5. Step 5: Solve for x
   x = 1,443,484.85/1,359.10
6. Step 6: Final answer
   x = 1,062.09