Finding the Fourth Proportional to 1,061.79, 1,589.31 and 768.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.79 : 1,589.31 = 768.30 : x
2. Step 2: Convert to fraction form
   1,061.79/1,589.31 = 768.30/x
3. Step 3: Cross multiply
   1,061.79x = 1,589.31 × 768.30
4. Step 4: Simplify right side
   1,061.79x = 1,221,066.87
5. Step 5: Solve for x
   x = 1,221,066.87/1,061.79
6. Step 6: Final answer
   x = 1,150.01