Finding the Fourth Proportional to 768.42, 1,061.78 and 670.01

Step by Step Solution

1. Step 1: Write the proportion equation
   768.42 : 1,061.78 = 670.01 : x
2. Step 2: Convert to fraction form
   768.42/1,061.78 = 670.01/x
3. Step 3: Cross multiply
   768.42x = 1,061.78 × 670.01
4. Step 4: Simplify right side
   768.42x = 711,394.56
5. Step 5: Solve for x
   x = 711,394.56/768.42
6. Step 6: Final answer
   x = 925.79