Finding the Fourth Proportional to 1,358.80, 1,875.20 and 769.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.80 : 1,875.20 = 769.34 : x
2. Step 2: Convert to fraction form
   1,358.80/1,875.20 = 769.34/x
3. Step 3: Cross multiply
   1,358.80x = 1,875.20 × 769.34
4. Step 4: Simplify right side
   1,358.80x = 1,442,666.37
5. Step 5: Solve for x
   x = 1,442,666.37/1,358.80
6. Step 6: Final answer
   x = 1,061.72