Finding the Fourth Proportional to 1,398.77, 1,930.23 and 769.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.77 : 1,930.23 = 769.32 : x
2. Step 2: Convert to fraction form
   1,398.77/1,930.23 = 769.32/x
3. Step 3: Cross multiply
   1,398.77x = 1,930.23 × 769.32
4. Step 4: Simplify right side
   1,398.77x = 1,484,967.54
5. Step 5: Solve for x
   x = 1,484,967.54/1,398.77
6. Step 6: Final answer
   x = 1,061.62