Finding the Fourth Proportional to 1,393.55, 1,923.10 and 764.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.55 : 1,923.10 = 764.09 : x
2. Step 2: Convert to fraction form
   1,393.55/1,923.10 = 764.09/x
3. Step 3: Cross multiply
   1,393.55x = 1,923.10 × 764.09
4. Step 4: Simplify right side
   1,393.55x = 1,469,409.95
5. Step 5: Solve for x
   x = 1,469,409.95/1,393.55
6. Step 6: Final answer
   x = 1,054.43