Finding the Fourth Proportional to 1,393.98, 1,923.62 and 764.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.98 : 1,923.62 = 764.49 : x
2. Step 2: Convert to fraction form
   1,393.98/1,923.62 = 764.49/x
3. Step 3: Cross multiply
   1,393.98x = 1,923.62 × 764.49
4. Step 4: Simplify right side
   1,393.98x = 1,470,587.27
5. Step 5: Solve for x
   x = 1,470,587.27/1,393.98
6. Step 6: Final answer
   x = 1,054.95